diff --git a/apps/backend/src/db/migrations/001_init.sql b/apps/backend/src/db/migrations/001_init.sql
index 7f6bc9f5..c53ee619 100644
--- a/apps/backend/src/db/migrations/001_init.sql
+++ b/apps/backend/src/db/migrations/001_init.sql
@@ -6,6 +6,7 @@ CREATE TABLE IF NOT EXISTS admin_users (
   password_hash TEXT NOT NULL,
   role TEXT NOT NULL,
   status TEXT NOT NULL,
+  session_version INTEGER NOT NULL DEFAULT 1,
   created_at TIMESTAMPTZ NOT NULL,
   updated_at TIMESTAMPTZ NOT NULL
 );
diff --git a/apps/backend/src/db/migrations/002_admin_session_version.sql b/apps/backend/src/db/migrations/002_admin_session_version.sql
new file mode 100644
index 00000000..7b2e0d62
--- /dev/null
+++ b/apps/backend/src/db/migrations/002_admin_session_version.sql
@@ -0,0 +1,2 @@
+ALTER TABLE admin_users
+  ADD COLUMN IF NOT EXISTS session_version INTEGER NOT NULL DEFAULT 1;
diff --git a/apps/backend/src/repositories/admin-user-repo.ts b/apps/backend/src/repositories/admin-user-repo.ts
index 22044d99..b8f0f99d 100644
--- a/apps/backend/src/repositories/admin-user-repo.ts
+++ b/apps/backend/src/repositories/admin-user-repo.ts
@@ -6,6 +6,7 @@ type AdminUserRow = {
   password_hash: string
   role: string
   status: string
+  session_version: number
   created_at: string
   updated_at: string
 }
@@ -21,7 +22,7 @@ type AdminUserCreateInput = {
 
 type AdminUserPatch = Partial<Pick<
   AdminUserRow,
-  'username' | 'password_hash' | 'role' | 'status' | 'updated_at'
+  'username' | 'password_hash' | 'role' | 'status' | 'session_version' | 'updated_at'
 >>
 
 type AdminUserListInput = {
@@ -66,9 +67,10 @@ export async function createAdminUser(input: AdminUserCreateInput): Promise<Admi
         password_hash,
         role,
         status,
+        session_version,
         created_at,
         updated_at
-      ) VALUES ($1, $2, $3, $4, $5, $6)
+      ) VALUES ($1, $2, $3, $4, $5, $6, $7)
       RETURNING id
     `,
     [
@@ -76,6 +78,7 @@ export async function createAdminUser(input: AdminUserCreateInput): Promise<Admi
       input.passwordHash,
       input.role,
       input.status,
+      1,
       input.createdAt,
       input.updatedAt,
     ],
@@ -102,8 +105,9 @@ export async function updateAdminUser(
         password_hash = $2,
         role = $3,
         status = $4,
-        updated_at = $5
-      WHERE id = $6
+        session_version = $5,
+        updated_at = $6
+      WHERE id = $7
       RETURNING id
     `,
     [
@@ -111,6 +115,7 @@ export async function updateAdminUser(
       next.password_hash,
       next.role,
       next.status,
+      Number(next.session_version || 1),
       next.updated_at,
       Number(userId),
     ],
diff --git a/apps/backend/src/repositories/fulfillment-profile-repo.ts b/apps/backend/src/repositories/fulfillment-profile-repo.ts
index f1027ace..91abfe4f 100644
--- a/apps/backend/src/repositories/fulfillment-profile-repo.ts
+++ b/apps/backend/src/repositories/fulfillment-profile-repo.ts
@@ -61,7 +61,7 @@ type FulfillmentProfileUpsertInput = {
   updatedAt: string
 }
 
-type FulfillmentProfileRequirementInput = {
+export type FulfillmentProfileRequirementInput = {
   roleKey: string
   credentialType: string
   quantityPerUnit?: number | string
diff --git a/apps/backend/src/services/admin/admin-auth-service.ts b/apps/backend/src/services/admin/admin-auth-service.ts
index f6378cbd..13d2294a 100644
--- a/apps/backend/src/services/admin/admin-auth-service.ts
+++ b/apps/backend/src/services/admin/admin-auth-service.ts
@@ -23,6 +23,7 @@ export type AdminSession = {
   username: string
   role: AdminRole
   expiresAt: string
+  sessionVersion: number
 }
 
 type AdminRole = 'admin' | 'operator' | 'support'
@@ -137,12 +138,22 @@ export async function verifyAdminSessionToken(token: unknown): Promise<AdminSess
     })
   }
 
+  const tokenSessionVersion = Number(payload?.ver || 0)
+  const currentSessionVersion = normalizeAdminSessionVersion(user.session_version)
+  if (tokenSessionVersion !== currentSessionVersion) {
+    throw createHttpError('后台登录态已失效，请重新登录', {
+      statusCode: 401,
+      errorCode: 'admin_auth_stale',
+    })
+  }
+
   return {
     sessionId: String(payload?.sid || '').trim(),
     userId: Number(user.id),
     username: String(user.username || ''),
     role: normalizeAdminRole(user.role),
     expiresAt,
+    sessionVersion: currentSessionVersion,
   }
 }
 
@@ -248,6 +259,7 @@ export async function updateManagedAdminUserRole(
   await ensureAdminUserChangeAllowed(user, { nextRole: role }, session)
   const updated = await updateAdminUser(user.id, {
     role,
+    session_version: nextAdminSessionVersion(user),
     updated_at: nowIso(),
   })
 
@@ -273,6 +285,7 @@ export async function updateManagedAdminUserStatus(
   await ensureAdminUserChangeAllowed(user, { nextStatus: status }, session)
   const updated = await updateAdminUser(user.id, {
     status,
+    session_version: nextAdminSessionVersion(user),
     updated_at: nowIso(),
   })
 
@@ -295,6 +308,7 @@ export async function resetManagedAdminUserPassword(userId: number | string, pay
   validatePassword(password)
   const updated = await updateAdminUser(user.id, {
     password_hash: hashAdminPassword(password),
+    session_version: nextAdminSessionVersion(user),
     updated_at: nowIso(),
   })
 
@@ -325,6 +339,7 @@ function createAdminSession(user: AdminUserRow): JsonObject {
     uid: Number(user.id),
     usr: String(user.username || ''),
     role: normalizeAdminRole(user.role),
+    ver: normalizeAdminSessionVersion(user.session_version),
     iat: issuedAt,
     exp: expiresAt,
   }
@@ -430,6 +445,15 @@ function validatePassword(password: string): void {
   }
 }
 
+function normalizeAdminSessionVersion(value: unknown): number {
+  const parsed = Number(value)
+  return Number.isInteger(parsed) && parsed > 0 ? parsed : 1
+}
+
+function nextAdminSessionVersion(user: AdminUserRow): number {
+  return normalizeAdminSessionVersion(user.session_version) + 1
+}
+
 async function getRequiredAdminUser(userId: number | string): Promise<AdminUserRow> {
   const user = await getAdminUserById(Number(userId))
 
diff --git a/apps/backend/src/services/admin/admin-read-shared-helpers.ts b/apps/backend/src/services/admin/admin-read-shared-helpers.ts
index f111760c..f7a5c27b 100644
--- a/apps/backend/src/services/admin/admin-read-shared-helpers.ts
+++ b/apps/backend/src/services/admin/admin-read-shared-helpers.ts
@@ -86,7 +86,7 @@ export function mapKuaishouCloudFulfillmentContext(value: unknown): JsonRecord |
       prepareStatus: String(binding.prepareStatus || 'pending').trim() || 'pending',
       cloudSourceKey: String(binding.cloudSourceKey || '').trim(),
       cloudSourceKeyFallbacks: Array.isArray(binding.cloudSourceKeyFallbacks)
-        ? binding.cloudSourceKeyFallbacks.map((value) => String(value || '').trim()).filter(Boolean)
+        ? binding.cloudSourceKeyFallbacks.map((value: unknown) => String(value || '').trim()).filter(Boolean)
         : [],
       resolvedSourceKey: String(binding.resolvedSourceKey || '').trim(),
       skuId: Number(binding.skuId || 0) || 0,
diff --git a/apps/backend/src/services/admin/platform-config/notification-service.ts b/apps/backend/src/services/admin/platform-config/notification-service.ts
index b90e51e8..1b419136 100644
--- a/apps/backend/src/services/admin/platform-config/notification-service.ts
+++ b/apps/backend/src/services/admin/platform-config/notification-service.ts
@@ -95,7 +95,7 @@ function mapAdminNotificationConfig(config: JsonObject = {}) {
       bark: {
         enabled: bark.enabled !== false,
         serverUrl: String(bark.serverUrl || 'https://api.day.app').trim(),
-        recipients: (Array.isArray(bark.recipients) ? bark.recipients : []).map((item) => ({
+        recipients: (Array.isArray(bark.recipients) ? bark.recipients : []).map((item: JsonObject) => ({
           id: String(item.id || '').trim(),
           name: String(item.name || '').trim(),
           deviceKey: String(item.deviceKey || '').trim(),
@@ -105,7 +105,7 @@ function mapAdminNotificationConfig(config: JsonObject = {}) {
       },
       wpush: {
         enabled: wpush.enabled !== false,
-        recipients: (Array.isArray(wpush.recipients) ? wpush.recipients : []).map((item) => ({
+        recipients: (Array.isArray(wpush.recipients) ? wpush.recipients : []).map((item: JsonObject) => ({
           id: String(item.id || '').trim(),
           name: String(item.name || '').trim(),
           apiKey: String(item.apiKey || item.apikey || '').trim(),
@@ -146,7 +146,7 @@ function mapAdminScheduledJobsConfig(config: JsonObject = {}) {
 function listAdminCloudtentaclesMonitorAccounts() {
   const sourcesConfig = listCloudtentaclesSources()
   const sessionsConfig = getAllCloudtentaclesSessionStates()
-  const sessions = sessionsConfig.sessions || {}
+  const sessions: Record<string, JsonObject> = sessionsConfig.sessions || {}
 
   return (Array.isArray(sourcesConfig.sources) ? sourcesConfig.sources : []).map((source) => {
     const sourceKey = String(source.key || '').trim()
diff --git a/apps/backend/src/services/admin/write/kuaishou-cloud-actions.ts b/apps/backend/src/services/admin/write/kuaishou-cloud-actions.ts
index a3818bbb..cd31ff02 100644
--- a/apps/backend/src/services/admin/write/kuaishou-cloud-actions.ts
+++ b/apps/backend/src/services/admin/write/kuaishou-cloud-actions.ts
@@ -171,7 +171,7 @@ export async function prepareAdminTaskKuaishouCloudFulfillment(
         bindUrl: preparedBinding.bindUrl,
         bindPreparedAt: now,
         bindExpiresAt: resolveKuaishouCloudBindUrlExpiresAt(now),
-        bindProbeAt: null,
+        bindProbeAt: null as null,
         bindProbeStatus: 'pending',
         bindProbeMessage: '',
         roleName: '',
@@ -181,9 +181,9 @@ export async function prepareAdminTaskKuaishouCloudFulfillment(
         status: 'pending',
         name: '',
         rid: '',
-        refreshedAt: null,
+        refreshedAt: null as null,
         errorMessage: '',
-        rawInfo: null,
+        rawInfo: null as null,
       },
       purchase: {
         ...flowWithResolvedBinding.purchase,
diff --git a/apps/backend/src/services/bootstrap/fulfillment-bootstrap-service.ts b/apps/backend/src/services/bootstrap/fulfillment-bootstrap-service.ts
index 3ea42216..8d5c0328 100644
--- a/apps/backend/src/services/bootstrap/fulfillment-bootstrap-service.ts
+++ b/apps/backend/src/services/bootstrap/fulfillment-bootstrap-service.ts
@@ -4,6 +4,7 @@ import {
   replaceFulfillmentProfileRequirements,
   upsertFulfillmentProfile,
   upsertSkuFulfillmentBinding,
+  type FulfillmentProfileRequirementInput,
 } from '../../repositories/fulfillment-profile-repo.js'
 import { upsertProductMatchRule } from '../../repositories/product-match-rule-repo.js'
 import { normalizeProductName } from '../order/product-match-service.js'
@@ -14,7 +15,18 @@ import {
 } from '../order/kuaishou-cloud-fulfillment-config-service.js'
 import { nowIso } from '../../utils/time.js'
 
-const CORE_PROFILES = [
+type JsonObject = Record<string, any>
+type CoreProfile = {
+  profileKey: string
+  name: string
+  executorKey: string
+  requiresClaim: boolean
+  autoDispatch: boolean
+  inventoryStrategy: string
+  requirements: FulfillmentProfileRequirementInput[]
+}
+
+const CORE_PROFILES: CoreProfile[] = [
   {
     profileKey: 'manual_review',
     name: '人工发货',
@@ -35,8 +47,6 @@ const CORE_PROFILES = [
   },
 ]
 
-type JsonObject = Record<string, any>
-
 export async function ensureFulfillmentCatalogBootstrapped() {
   const profileMap = await ensureCoreProfiles()
   await syncConfiguredFulfillmentBindings(profileMap)
@@ -44,7 +54,7 @@ export async function ensureFulfillmentCatalogBootstrapped() {
 
 async function ensureCoreProfiles() {
   const timestamp = nowIso()
-  const profileMap = {}
+  const profileMap: JsonObject = {}
 
   for (const profile of CORE_PROFILES) {
     const saved = await upsertFulfillmentProfile({
@@ -148,6 +158,6 @@ function resolveBindingRuntimeConfig(binding: JsonObject = {}) {
   return baseConfig
 }
 
-function isPlainObject(value) {
+function isPlainObject(value: unknown): value is JsonObject {
   return Object.prototype.toString.call(value) === '[object Object]'
 }
diff --git a/apps/backend/src/services/claim/kuaishou-cloud-claim-context.ts b/apps/backend/src/services/claim/kuaishou-cloud-claim-context.ts
index 8f40357a..f0126b70 100644
--- a/apps/backend/src/services/claim/kuaishou-cloud-claim-context.ts
+++ b/apps/backend/src/services/claim/kuaishou-cloud-claim-context.ts
@@ -7,10 +7,19 @@ import { formatFenToAmount, normalizeFen } from '../../utils/money.js'
 import { parseTaskContext as parseTaskContextValue } from '../../utils/task-json.js'
 import { nowIso } from '../../utils/time.js'
 import { buildClaimUrl } from './claim-service.js'
+import type { ClaimTokenRow, OrderItemRow, OrderRow, TaskRow } from '../../types/repository-rows.js'
 
 export const CLAIM_TERMINAL_STATUSES = new Set(['expired', 'closed'])
 export const KUAISHOU_CLOUD_CLAIM_GUIDE_BASE_PATH = '/kuaishou-cloud-guide'
 
+type JsonObject = Record<string, any>
+type ClaimContext = {
+  claimToken: ClaimTokenRow
+  task: TaskRow
+  order: OrderRow
+  orderItem: OrderItemRow
+}
+
 export async function getClaimContext(token: unknown) {
   const normalized = String(token || '').trim()
 
@@ -76,7 +85,7 @@ export async function getClaimContext(token: unknown) {
   }
 }
 
-export function buildClaimDetailPayload({ claimToken, task, order, orderItem }) {
+export function buildClaimDetailPayload({ claimToken, task, order, orderItem }: ClaimContext) {
   const kuaishouCloudFulfillment = mapClaimKuaishouCloudFulfillment(task, order)
 
   return {
@@ -113,7 +122,7 @@ export function buildClaimDetailPayload({ claimToken, task, order, orderItem })
       skuName: orderItem.sku_name,
       quantity: orderItem.quantity,
     },
-    session: null,
+    session: null as null,
     kuaishouCloudFulfillment,
     result: task.redeemed_at
       ? {
@@ -126,7 +135,7 @@ export function buildClaimDetailPayload({ claimToken, task, order, orderItem })
   }
 }
 
-export function mapClaimKuaishouCloudFulfillment(task, order) {
+export function mapClaimKuaishouCloudFulfillment(task: TaskRow, order: OrderRow) {
   if (String(task?.executor_key || '').trim() !== 'kuaishou_ct_assisted') {
     return null
   }
@@ -213,11 +222,11 @@ export function mapClaimKuaishouCloudFulfillment(task, order) {
   }
 }
 
-function parseTaskContext(task) {
+function parseTaskContext(task: TaskRow): JsonObject {
   return parseTaskContextValue(task)
 }
 
-async function expireClaimContext(claimToken, task) {
+async function expireClaimContext(claimToken: ClaimTokenRow, task: TaskRow) {
   const now = nowIso()
   const nextClaimToken = await updateClaimToken(claimToken.id, {
     status: 'expired',
diff --git a/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts b/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts
index 8209cacc..397e40dc 100644
--- a/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts
+++ b/apps/backend/src/services/claim/kuaishou-cloud-claim-service.ts
@@ -20,6 +20,7 @@ import {
 } from '../fulfillment/kuaishou-cloud-task-service.js'
 import { buildClaimDetailPayload, getClaimContext } from './kuaishou-cloud-claim-context.js'
 import { syncKuaishouCloudRoleInfo } from './kuaishou-cloud-sync-service.js'
+import type { TaskRow } from '../../types/repository-rows.js'
 
 const KUAISHOU_CLOUD_GUIDE_DIR = path.resolve(PROJECT_ROOT, '../../tems/imgs')
 const ALLOWED_GUIDE_FILES = new Set(['1.png', '2.png', '3.png'])
@@ -136,7 +137,7 @@ export async function verifyKuaishouCloudClaimTicket(token: unknown, payload: Js
   return getKuaishouCloudClaimDetail(token)
 }
 
-export async function getKuaishouCloudClaimGuideAssetPath(filename) {
+export async function getKuaishouCloudClaimGuideAssetPath(filename: unknown) {
   const normalized = String(filename || '').trim()
   if (!ALLOWED_GUIDE_FILES.has(normalized)) {
     throw createHttpError('指引图片不存在', {
@@ -172,7 +173,7 @@ export async function getKuaishouCloudClaimDetail(token: unknown) {
   })
 }
 
-function parseTaskContext(task) {
+function parseTaskContext(task: Partial<TaskRow> | null | undefined): JsonObject {
   const rawValue = task?.context_json
   if (!rawValue) {
     return {}
@@ -189,7 +190,7 @@ function parseTaskContext(task) {
   }
 }
 
-export async function confirmKuaishouCloudClaimRole(token) {
+export async function confirmKuaishouCloudClaimRole(token: unknown) {
   const context = await getClaimContext(token)
   const now = nowIso()
 
@@ -245,7 +246,7 @@ export async function confirmKuaishouCloudClaimRole(token) {
   return getKuaishouCloudClaimDetail(token)
 }
 
-export async function redeemKuaishouCloudClaim(token) {
+export async function redeemKuaishouCloudClaim(token: unknown) {
   const context = await getClaimContext(token)
   const now = nowIso()
 
diff --git a/apps/backend/src/services/claim/kuaishou-cloud-sync-service.ts b/apps/backend/src/services/claim/kuaishou-cloud-sync-service.ts
index f9290902..ad8fcce4 100644
--- a/apps/backend/src/services/claim/kuaishou-cloud-sync-service.ts
+++ b/apps/backend/src/services/claim/kuaishou-cloud-sync-service.ts
@@ -4,8 +4,9 @@ import {
   probeKuaishouCloudTaskBindUrl,
   refreshKuaishouCloudTaskRoleInfo,
 } from '../fulfillment/kuaishou-cloud-task-service.js'
+import type { TaskRow } from '../../types/repository-rows.js'
 
-export async function syncKuaishouCloudRoleInfo(task) {
+export async function syncKuaishouCloudRoleInfo(task: TaskRow) {
   const flow = normalizeKuaishouCloudFlow(parseTaskContext(task).kuaishouCloudFulfillment)
 
   if (!flow.binding.vnId || !flow.binding.vnKey || !flow.binding.vnPhone) {
@@ -42,7 +43,7 @@ export async function syncKuaishouCloudRoleInfo(task) {
   }
 }
 
-function parseTaskContext(task) {
+function parseTaskContext(task: Partial<TaskRow> | null | undefined): Record<string, any> {
   const rawValue = task?.context_json
 
   if (!rawValue) {
diff --git a/apps/backend/src/services/fulfillment/kuaishou-cloud-task-service.ts b/apps/backend/src/services/fulfillment/kuaishou-cloud-task-service.ts
index 51aca310..40e3d8cb 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-cloud-task-service.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-cloud-task-service.ts
@@ -43,6 +43,7 @@ import {
   normalizeActor,
   parseTaskContext,
 } from "./kuaishou-cloud/task-context.js";
+import type { TaskRow } from "../../types/repository-rows.js";
 
 export {
   isKuaishouCloudBindUrlFresh,
@@ -58,7 +59,7 @@ export {
   resolvePersistedCloudtentaclesContextWithFallback,
 } from "./kuaishou-cloud/cloudtentacles-context.js";
 
-export async function ensureTaskClaimLink(task) {
+export async function ensureTaskClaimLink(task: TaskRow) {
   const tokenStatus = String(task?.primary_claim_token_status || "").trim();
   const token = String(
     task?.primary_claim_token || task?.claim_token || ""
@@ -82,7 +83,7 @@ export async function ensureTaskClaimLink(task) {
 }
 
 export async function prepareKuaishouCloudFulfillmentTask(
-  task,
+  task: TaskRow,
   options: JsonObject = {}
 ) {
   if (!isKuaishouCloudTask(task)) {
@@ -246,7 +247,7 @@ export async function prepareKuaishouCloudFulfillmentTask(
         bindUrl: preparedBinding.bindUrl,
         bindPreparedAt: now,
         bindExpiresAt: resolveKuaishouCloudBindUrlExpiresAt(now),
-        bindProbeAt: null,
+        bindProbeAt: null as null,
         bindProbeStatus: "pending",
         bindProbeMessage: "",
         roleName: "",
@@ -256,9 +257,9 @@ export async function prepareKuaishouCloudFulfillmentTask(
         status: "pending",
         name: "",
         rid: "",
-        refreshedAt: null,
+        refreshedAt: null as null,
         errorMessage: "",
-        rawInfo: null,
+        rawInfo: null as null,
       },
       purchase: {
         ...flowWithResolvedBinding.purchase,
@@ -312,7 +313,7 @@ export async function prepareKuaishouCloudFulfillmentTask(
 }
 
 export async function refreshKuaishouCloudTaskBindUrl(
-  task,
+  task: TaskRow,
   options: JsonObject = {}
 ) {
   if (!isKuaishouCloudTask(task)) {
@@ -413,7 +414,7 @@ export async function refreshKuaishouCloudTaskBindUrl(
         bindUrl: preparedBinding.bindUrl,
         bindPreparedAt: now,
         bindExpiresAt: resolveKuaishouCloudBindUrlExpiresAt(now),
-        bindProbeAt: null,
+        bindProbeAt: null as null,
         bindProbeStatus: "pending",
         bindProbeMessage: "",
         roleName:
@@ -485,7 +486,7 @@ export async function refreshKuaishouCloudTaskBindUrl(
 }
 
 export async function probeKuaishouCloudTaskBindUrl(
-  task,
+  task: TaskRow,
   options: JsonObject = {}
 ) {
   if (!isKuaishouCloudTask(task)) {
@@ -503,7 +504,7 @@ export async function probeKuaishouCloudTaskBindUrl(
     return {
       task,
       flow,
-      probe: null,
+      probe: null as null,
     };
   }
 
@@ -518,7 +519,7 @@ export async function probeKuaishouCloudTaskBindUrl(
     return {
       task,
       flow,
-      probe: null,
+      probe: null as null,
     };
   }
 
@@ -582,7 +583,7 @@ export async function probeKuaishouCloudTaskBindUrl(
  * @param {{ taskContext?: any, flow?: any, now?: string, actor?: any, error?: unknown }} [input]
  */
 async function markKuaishouCloudBindUrlRefreshFailed(
-  task,
+  task: TaskRow,
   { taskContext, flow, now, actor, error }: JsonObject = {}
 ) {
   const errorMessage =
@@ -648,7 +649,7 @@ async function markKuaishouCloudBindUrlRefreshFailed(
 }
 
 export async function refreshKuaishouCloudTaskRoleInfo(
-  task,
+  task: TaskRow,
   options: JsonObject = {}
 ) {
   if (!isKuaishouCloudTask(task)) {
diff --git a/apps/backend/src/services/fulfillment/kuaishou-cloud/binding-resources.ts b/apps/backend/src/services/fulfillment/kuaishou-cloud/binding-resources.ts
index 69b22b04..92cb3120 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-cloud/binding-resources.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-cloud/binding-resources.ts
@@ -11,8 +11,8 @@ import {
 import { KUAISHOU_CLOUD_FIXED_VN_KEY, type JsonObject } from "./domain.js";
 
 export function resolveKuaishouCloudBindingResources(
-  flow,
-  { skuItems = [], knapsackItems = [] } = {}
+  flow: JsonObject,
+  { skuItems = [], knapsackItems = [] }: { skuItems?: unknown[], knapsackItems?: unknown[] } = {}
 ) {
   const normalizedSkuItems = Array.isArray(skuItems)
     ? skuItems.filter(isCloudSkuLikeItem)
@@ -70,7 +70,7 @@ export function resolveKuaishouCloudBindingResources(
   };
 }
 
-export function resolveKuaishouCloudVnKeyCandidates(_input = {}) {
+export function resolveKuaishouCloudVnKeyCandidates(_input: JsonObject = {}) {
   return [KUAISHOU_CLOUD_FIXED_VN_KEY];
 }
 
@@ -159,7 +159,7 @@ export async function prepareKuaishouCloudBindResourceWithFallback(input: JsonOb
   );
 }
 
-function collectKuaishouCloudNameCandidates(flow) {
+function collectKuaishouCloudNameCandidates(flow: JsonObject) {
   return Array.from(
     new Set(
       [
@@ -171,10 +171,10 @@ function collectKuaishouCloudNameCandidates(flow) {
   );
 }
 
-function findCloudItemByNames(items, nameCandidates, preferredId = 0) {
+function findCloudItemByNames(items: JsonObject[], nameCandidates: string[], preferredId = 0) {
   const normalizedItems = Array.isArray(items) ? items : [];
   const normalizedNames = nameCandidates
-    .map((item) => ({
+    .map((item: string) => ({
       raw: String(item || "").trim(),
       normalized: normalizeProductName(item),
     }))
@@ -182,34 +182,34 @@ function findCloudItemByNames(items, nameCandidates, preferredId = 0) {
 
   if (normalizedNames.length === 0 || normalizedItems.length === 0) {
     return preferredId > 0
-      ? normalizedItems.find((item) => Number(item.id || 0) === preferredId) ||
+      ? normalizedItems.find((item: JsonObject) => Number(item.id || 0) === preferredId) ||
           null
       : null;
   }
 
   if (preferredId > 0) {
     const preferred =
-      normalizedItems.find((item) => Number(item.id || 0) === preferredId) ||
+      normalizedItems.find((item: JsonObject) => Number(item.id || 0) === preferredId) ||
       null;
     if (preferred) {
       return preferred;
     }
   }
 
-  const exactMatches = normalizedItems.filter((item) => {
+  const exactMatches = normalizedItems.filter((item: JsonObject) => {
     const itemName = normalizeProductName(item.name);
     return normalizedNames.some(
-      (candidate) => candidate.normalized === itemName
+      (candidate: { normalized: string }) => candidate.normalized === itemName
     );
   });
   if (exactMatches.length > 0) {
     return exactMatches[0];
   }
 
-  const partialMatches = normalizedItems.filter((item) => {
+  const partialMatches = normalizedItems.filter((item: JsonObject) => {
     const itemName = normalizeProductName(item.name);
     return normalizedNames.some(
-      (candidate) =>
+      (candidate: { normalized: string }) =>
         itemName.includes(candidate.normalized) ||
         candidate.normalized.includes(itemName)
     );
@@ -224,13 +224,15 @@ function findCloudItemByNames(items, nameCandidates, preferredId = 0) {
   return null;
 }
 
-function isCloudSkuLikeItem(item) {
-  return Boolean(item) && typeof item === "object" && Number(item.id || 0) > 0;
+function isCloudSkuLikeItem(item: unknown): item is JsonObject {
+  const current = item && typeof item === "object" ? item as JsonObject : {};
+  return Number(current.id || 0) > 0;
 }
 
-function isRecoverableKuaishouCloudVnKeyError(error) {
-  const errorCode = String(error?.errorCode || error?.code || "").trim();
-  const errorMessage = String(error?.message || "").trim();
+function isRecoverableKuaishouCloudVnKeyError(error: unknown) {
+  const current = error && typeof error === "object" ? error as JsonObject : {};
+  const errorCode = String(current.errorCode || current.code || "").trim();
+  const errorMessage = String(current.message || "").trim();
   return (
     errorCode === "cloudtentacles_vn_bind_url_failed" &&
     errorMessage.includes("不支持的游戏类型")
diff --git a/apps/backend/src/services/fulfillment/kuaishou-cloud/cloudtentacles-context.ts b/apps/backend/src/services/fulfillment/kuaishou-cloud/cloudtentacles-context.ts
index d6977a6c..6ed8118e 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-cloud/cloudtentacles-context.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-cloud/cloudtentacles-context.ts
@@ -45,7 +45,7 @@ export function resolvePersistedCloudtentaclesContext(sourceKey = "default") {
  */
 export function resolvePersistedCloudtentaclesContextWithFallback(
   primarySourceKey = "default",
-  fallbacks = []
+  fallbacks: unknown[] = []
 ) {
   const candidates = [
     String(primarySourceKey || "default").trim() || "default",
diff --git a/apps/backend/src/services/fulfillment/kuaishou-cloud/domain.ts b/apps/backend/src/services/fulfillment/kuaishou-cloud/domain.ts
index 57668f5e..676ce7d1 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-cloud/domain.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-cloud/domain.ts
@@ -8,12 +8,13 @@ export const KUAISHOU_CLOUD_FIXED_VN_KEY = "1";
 
 export type JsonObject = Record<string, any>;
 
-export function isKuaishouCloudTask(task) {
-  return String(task?.executor_key || "").trim() === "kuaishou_ct_assisted";
+export function isKuaishouCloudTask(task: unknown) {
+  const source = task && typeof task === "object" ? task as JsonObject : {};
+  return String(source.executor_key || "").trim() === "kuaishou_ct_assisted";
 }
 
-export function normalizeKuaishouCloudFlow(value) {
-  const source = value && typeof value === "object" ? value : {};
+export function normalizeKuaishouCloudFlow(value: unknown) {
+  const source: JsonObject = value && typeof value === "object" ? value as JsonObject : {};
   const binding =
     source.binding && typeof source.binding === "object" ? source.binding : {};
   const role =
@@ -129,8 +130,8 @@ export function normalizeKuaishouCloudFlow(value) {
   };
 }
 
-export function normalizeKuaishouCloudRoleInfo(value) {
-  const rawInfo = value && typeof value === "object" ? value : null;
+export function normalizeKuaishouCloudRoleInfo(value: unknown) {
+  const rawInfo: JsonObject | null = value && typeof value === "object" ? value as JsonObject : null;
   const nestedBindInfo =
     rawInfo?.sBindInfo && typeof rawInfo.sBindInfo === "object"
       ? rawInfo.sBindInfo
@@ -157,15 +158,15 @@ export function normalizeKuaishouCloudRoleInfo(value) {
   };
 }
 
-export function maskPhone(value) {
+export function maskPhone(value: unknown) {
   return maskPhoneValue(value);
 }
 
-export function maskCode(value) {
+export function maskCode(value: unknown) {
   return maskCodeValue(value);
 }
 
-export function resolveKuaishouCloudBindUrlExpiresAt(preparedAt) {
+export function resolveKuaishouCloudBindUrlExpiresAt(preparedAt: unknown) {
   const preparedTime = Date.parse(String(preparedAt || ""));
   if (!Number.isFinite(preparedTime)) {
     return null;
@@ -176,7 +177,7 @@ export function resolveKuaishouCloudBindUrlExpiresAt(preparedAt) {
   return new Date(preparedTime + Math.max(1, ttlSeconds) * 1000).toISOString();
 }
 
-export function isKuaishouCloudBindUrlFresh(flow, now = new Date()) {
+export function isKuaishouCloudBindUrlFresh(flow: unknown, now = new Date()) {
   const normalizedFlow = normalizeKuaishouCloudFlow(flow);
   if (!normalizedFlow.binding.bindUrl) {
     return false;
@@ -195,7 +196,7 @@ export function isKuaishouCloudBindUrlFresh(flow, now = new Date()) {
   return expiresTime > now.getTime();
 }
 
-export function normalizeStringArray(value) {
+export function normalizeStringArray(value: unknown) {
   if (Array.isArray(value)) {
     return value.map((v) => String(v || "").trim()).filter(Boolean);
   }
diff --git a/apps/backend/src/services/fulfillment/kuaishou-cloud/task-context.ts b/apps/backend/src/services/fulfillment/kuaishou-cloud/task-context.ts
index dc28bada..6b259ee2 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-cloud/task-context.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-cloud/task-context.ts
@@ -1,14 +1,18 @@
 import { parseTaskContext as parseTaskContextValue } from "../../../utils/task-json.js";
+import type { TaskRow } from "../../../types/repository-rows.js";
 
-export function normalizeActor(actor) {
+type JsonObject = Record<string, any>;
+
+export function normalizeActor(actor: unknown) {
   if (!actor || typeof actor !== "object") {
     return null;
   }
 
-  const source = String(actor.source || "").trim();
-  const userId = Number(actor.userId || 0) || 0;
-  const username = String(actor.username || "").trim();
-  const role = String(actor.role || "").trim();
+  const current = actor as JsonObject;
+  const source = String(current.source || "").trim();
+  const userId = Number(current.userId || 0) || 0;
+  const username = String(current.username || "").trim();
+  const role = String(current.role || "").trim();
 
   if (!source && !userId && !username && !role) {
     return null;
@@ -22,19 +26,19 @@ export function normalizeActor(actor) {
   };
 }
 
-export function parseTaskContext(task) {
+export function parseTaskContext(task: Partial<TaskRow> | null | undefined) {
   return parseTaskContextValue(task);
 }
 
-export function getTaskClaimExpiresAt(task) {
+export function getTaskClaimExpiresAt(task: Partial<TaskRow> | null | undefined) {
   return task?.claim_expires_at || task?.primary_claim_expires_at || null;
 }
 
-export function isClaimExpired(expiredAt) {
+export function isClaimExpired(expiredAt: unknown) {
   if (!expiredAt) {
     return false;
   }
 
-  const timestamp = new Date(expiredAt).getTime();
+  const timestamp = new Date(expiredAt instanceof Date ? expiredAt : String(expiredAt || "")).getTime();
   return Number.isFinite(timestamp) && timestamp <= Date.now();
 }
diff --git a/apps/backend/src/services/fulfillment/kuaishou-cloud/task-finalization.ts b/apps/backend/src/services/fulfillment/kuaishou-cloud/task-finalization.ts
index 90414207..d82576f4 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-cloud/task-finalization.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-cloud/task-finalization.ts
@@ -20,9 +20,10 @@ import {
 } from "./domain.js";
 import { resolvePersistedCloudtentaclesContextWithFallback } from "./cloudtentacles-context.js";
 import { normalizeActor, parseTaskContext } from "./task-context.js";
+import type { TaskRow } from "../../../types/repository-rows.js";
 
 export async function dispatchKuaishouCloudFulfillmentTask(
-  task,
+  task: TaskRow,
   options: JsonObject = {}
 ) {
   if (!isKuaishouCloudTask(task)) {
@@ -157,7 +158,7 @@ export async function dispatchKuaishouCloudFulfillmentTask(
 }
 
 export async function returnKuaishouCloudFulfillmentTask(
-  task,
+  task: TaskRow,
   options: JsonObject = {}
 ) {
   if (!isKuaishouCloudTask(task)) {
diff --git a/apps/backend/src/services/notification/config-service.ts b/apps/backend/src/services/notification/config-service.ts
index cdd03559..56472ee8 100644
--- a/apps/backend/src/services/notification/config-service.ts
+++ b/apps/backend/src/services/notification/config-service.ts
@@ -7,6 +7,13 @@ const NOTIFICATION_CONFIG_FILE_PATH = path.join(PROJECT_ROOT, 'data', 'notificat
 const DEFAULT_BARK_SERVER_URL = 'https://api.day.app'
 
 type JsonObject = Record<string, any>
+type NotificationRecipient = {
+  id: string
+  name: string
+  deviceKey?: string
+  apiKey?: string
+  enabled: boolean
+}
 
 export function getNotificationConfigFilePath() {
   return NOTIFICATION_CONFIG_FILE_PATH
@@ -26,7 +33,7 @@ export function listEnabledBarkRecipients(config: JsonObject = getNotificationCo
   }
 
   return (Array.isArray(config.channels?.bark?.recipients) ? config.channels.bark.recipients : [])
-    .filter((item) => item.enabled !== false && String(item.deviceKey || '').trim())
+    .filter((item: JsonObject) => item.enabled !== false && String(item.deviceKey || '').trim())
 }
 
 export function listEnabledWpushRecipients(config: JsonObject = getNotificationConfig()) {
@@ -35,7 +42,7 @@ export function listEnabledWpushRecipients(config: JsonObject = getNotificationC
   }
 
   return (Array.isArray(config.channels?.wpush?.recipients) ? config.channels.wpush.recipients : [])
-    .filter((item) => item.enabled !== false && String(item.apiKey || item.apikey || '').trim())
+    .filter((item: JsonObject) => item.enabled !== false && String(item.apiKey || item.apikey || '').trim())
 }
 
 function loadNotificationConfigFromFile() {
@@ -58,20 +65,20 @@ export function normalizeNotificationConfig(rawValue: unknown) {
         enabled: typeof bark.enabled === 'boolean' ? bark.enabled : true,
         serverUrl: normalizeBarkServerUrl(bark.serverUrl),
         recipients: (Array.isArray(bark.recipients) ? bark.recipients : [])
-          .map((item) => normalizeBarkRecipient(item))
+          .map((item: unknown) => normalizeBarkRecipient(item))
           .filter(Boolean),
       },
       wpush: {
         enabled: typeof wpush.enabled === 'boolean' ? wpush.enabled : true,
         recipients: (Array.isArray(wpush.recipients) ? wpush.recipients : [])
-          .map((item) => normalizeWpushRecipient(item))
+          .map((item: unknown) => normalizeWpushRecipient(item))
           .filter(Boolean),
       },
     },
   }
 }
 
-function normalizeBarkRecipient(rawValue: unknown) {
+function normalizeBarkRecipient(rawValue: unknown): NotificationRecipient | null {
   if (!isPlainObject(rawValue)) {
     return null
   }
@@ -97,7 +104,7 @@ function normalizeBarkServerUrl(value: unknown) {
   return normalized.replace(/\/+$/, '')
 }
 
-function normalizeWpushRecipient(rawValue: unknown) {
+function normalizeWpushRecipient(rawValue: unknown): NotificationRecipient | null {
   if (!isPlainObject(rawValue)) {
     return null
   }
@@ -125,11 +132,11 @@ export function createDefaultNotificationConfig() {
       bark: {
         enabled: true,
         serverUrl: DEFAULT_BARK_SERVER_URL,
-        recipients: [],
+        recipients: [] as NotificationRecipient[],
       },
       wpush: {
         enabled: true,
-        recipients: [],
+        recipients: [] as NotificationRecipient[],
       },
     },
   }
diff --git a/apps/backend/src/services/notification/notification-service.ts b/apps/backend/src/services/notification/notification-service.ts
index 07646fba..090d5421 100644
--- a/apps/backend/src/services/notification/notification-service.ts
+++ b/apps/backend/src/services/notification/notification-service.ts
@@ -8,6 +8,7 @@ import { sendBarkNotification } from './bark-service.js'
 import { sendWpushNotification } from './wpush-service.js'
 
 type JsonObject = Record<string, any>
+type NotificationResult = ReturnType<typeof mapNotificationResult>
 type NotificationInput = {
   title?: string
   body?: string
@@ -31,12 +32,12 @@ export async function sendInternalNotification(input: NotificationInput = {}) {
       successCount: 0,
       failedCount: 0,
       skippedCount: barkRecipients.length + wpushRecipients.length,
-      results: [],
+      results: [] as NotificationResult[],
     }
   }
 
   const results = [
-    ...(await Promise.all(barkRecipients.map(async (recipient) => {
+    ...(await Promise.all(barkRecipients.map(async (recipient: JsonObject) => {
       try {
         const result = await sendBarkNotification({
           serverUrl: bark.serverUrl,
@@ -64,7 +65,7 @@ export async function sendInternalNotification(input: NotificationInput = {}) {
         )
       }
     }))),
-    ...(await Promise.all(wpushRecipients.map(async (recipient) => {
+    ...(await Promise.all(wpushRecipients.map(async (recipient: JsonObject) => {
       try {
         const result = await sendWpushNotification({
           recipient,
diff --git a/apps/backend/src/services/open-91/order-query-service.ts b/apps/backend/src/services/open-91/order-query-service.ts
index 0b39f832..7a5b3b73 100644
--- a/apps/backend/src/services/open-91/order-query-service.ts
+++ b/apps/backend/src/services/open-91/order-query-service.ts
@@ -23,8 +23,11 @@ import {
   OPEN_91_PROVIDER,
   resolveOpen91QueryState,
 } from './shared.js'
+import type { OrderRow } from '../../types/repository-rows.js'
 
-export async function queryOpen91Order(payload = {}, { requestId = '' } = {}) {
+type JsonObject = Record<string, any>
+
+export async function queryOpen91Order(payload: JsonObject = {}, { requestId = '' } = {}) {
   const config = assertOpen91Config()
   const normalized = normalizeOpen91QueryPayload(payload)
 
@@ -168,12 +171,12 @@ export async function queryOpen91Order(payload = {}, { requestId = '' } = {}) {
   return buildOpen91SuccessResponse(responseData)
 }
 
-function resolveOpen91OrderFailReason(order) {
+function resolveOpen91OrderFailReason(order: OrderRow) {
   const payload = parseJsonObject(order?.raw_payload_json)
   return String(payload.manualFailedReason || '').trim()
 }
 
-function parseJsonObject(value) {
+function parseJsonObject(value: unknown): JsonObject {
   if (!value) {
     return {}
   }
diff --git a/apps/backend/src/services/open-91/shared.ts b/apps/backend/src/services/open-91/shared.ts
index 096b28ca..41c47303 100644
--- a/apps/backend/src/services/open-91/shared.ts
+++ b/apps/backend/src/services/open-91/shared.ts
@@ -45,7 +45,7 @@ export function assertOpen91Config() {
   return config
 }
 
-export function normalizeOpen91String(value) {
+export function normalizeOpen91String(value: unknown) {
   return String(value || '').trim()
 }
 
@@ -187,7 +187,7 @@ export function assertOpen91Signature(params: JsonObject = {}, config = assertOp
   }
 }
 
-export function encryptOpen91Cards(cards = [], secret = assertOpen91Config().secret) {
+export function encryptOpen91Cards(cards: unknown[] = [], secret = assertOpen91Config().secret) {
   const normalizedSecret = normalizeOpen91String(secret)
   if (normalizedSecret.length !== 32) {
     throw createHttpError('91卡券 cards 加密密钥长度必须为 32 个字符', {
@@ -227,7 +227,7 @@ export function buildOpen91ErrorResponse(message: unknown, code = 500) {
   return {
     code,
     message: normalizeOpen91String(message) || '系统错误',
-    data: null,
+    data: null as null,
   }
 }
 
@@ -323,7 +323,7 @@ export function resolveOpen91QueryState(
   }
 }
 
-export function stringifyOpen91SignValue(value) {
+export function stringifyOpen91SignValue(value: unknown) {
   if (typeof value === 'number' && Number.isFinite(value)) {
     return String(value)
   }
@@ -339,12 +339,12 @@ export function stringifyOpen91SignValue(value) {
   return String(value)
 }
 
-function normalizeOpen91BuyNum(value) {
+function normalizeOpen91BuyNum(value: unknown) {
   const parsed = Number(value)
   return Number.isInteger(parsed) ? parsed : 0
 }
 
-function normalizeOpen91OptionalAmount(value) {
+function normalizeOpen91OptionalAmount(value: unknown) {
   const normalized = normalizeOpen91String(value)
   if (!normalized) {
     return ''
@@ -360,7 +360,7 @@ function normalizeOpen91OptionalAmount(value) {
   return normalized
 }
 
-function normalizeOpen91Timestamp(value) {
+function normalizeOpen91Timestamp(value: unknown) {
   const normalized = normalizeOpen91String(value)
   if (!/^\d{10}$/.test(normalized)) {
     return 0
diff --git a/apps/backend/src/services/order/kuaishou-cloud-fulfillment-config-service.ts b/apps/backend/src/services/order/kuaishou-cloud-fulfillment-config-service.ts
index dea4e65d..44f02040 100644
--- a/apps/backend/src/services/order/kuaishou-cloud-fulfillment-config-service.ts
+++ b/apps/backend/src/services/order/kuaishou-cloud-fulfillment-config-service.ts
@@ -20,7 +20,7 @@ export function getKuaishouCloudFulfillmentConfig() {
   return loadKuaishouCloudFulfillmentConfigFromFile();
 }
 
-export function saveKuaishouCloudFulfillmentConfig(rawValue) {
+export function saveKuaishouCloudFulfillmentConfig(rawValue: unknown) {
   return writeJsonFile(
     KUAISHOU_CLOUD_FULFILLMENT_FILE_PATH,
     rawValue,
@@ -94,19 +94,19 @@ function loadKuaishouCloudFulfillmentConfigFromFile() {
   );
 }
 
-function normalizeKuaishouCloudFulfillmentConfig(rawValue) {
+function normalizeKuaishouCloudFulfillmentConfig(rawValue: unknown) {
   const source = isPlainObject(rawValue) ? rawValue : {};
   return {
     enabled: source.enabled !== false,
     items: Array.isArray(source.items)
       ? source.items
-          .map((item) => normalizeKuaishouCloudFulfillmentItem(item))
+          .map((item: unknown) => normalizeKuaishouCloudFulfillmentItem(item))
           .filter(Boolean)
       : [],
   };
 }
 
-function normalizeKuaishouCloudFulfillmentItem(rawValue) {
+function normalizeKuaishouCloudFulfillmentItem(rawValue: unknown) {
   if (!isPlainObject(rawValue)) {
     return null;
   }
@@ -178,17 +178,17 @@ function normalizeKuaishouCloudFulfillmentItem(rawValue) {
   };
 }
 
-function normalizePositiveInteger(value) {
+function normalizePositiveInteger(value: unknown) {
   const parsed = Number(value);
   return Number.isInteger(parsed) && parsed > 0 ? parsed : 0;
 }
 
-function normalizeNonNegativeInteger(value, fallback) {
+function normalizeNonNegativeInteger(value: unknown, fallback: number) {
   const parsed = Number(value);
   return Number.isInteger(parsed) && parsed >= 0 ? parsed : fallback;
 }
 
-function normalizePriority(value) {
+function normalizePriority(value: unknown) {
   const parsed = Number(value);
   if (!Number.isFinite(parsed)) {
     return 100;
@@ -196,19 +196,19 @@ function normalizePriority(value) {
 
   return Math.max(1, Math.round(parsed));
 }
-function isPlainObject(value) {
+function isPlainObject(value: unknown): value is JsonObject {
   return Object.prototype.toString.call(value) === "[object Object]";
 }
 
-function normalizeStringArray(value) {
+function normalizeStringArray(value: unknown) {
   if (Array.isArray(value)) {
-    return value.map((v) => String(v || "").trim()).filter(Boolean);
+    return value.map((v: unknown) => String(v || "").trim()).filter(Boolean);
   }
   // 兼容旧格式：字符串用逗号分隔
   if (typeof value === "string") {
     return value
       .split(",")
-      .map((v) => v.trim())
+      .map((v: string) => v.trim())
       .filter(Boolean);
   }
   return [];
diff --git a/apps/backend/src/services/platforms/cloudtentacles/debug-flow-service.ts b/apps/backend/src/services/platforms/cloudtentacles/debug-flow-service.ts
index 0c22d88f..affde4f3 100644
--- a/apps/backend/src/services/platforms/cloudtentacles/debug-flow-service.ts
+++ b/apps/backend/src/services/platforms/cloudtentacles/debug-flow-service.ts
@@ -37,7 +37,7 @@ export async function runCloudtentaclesFullDebugFlow(payload: JsonObject = {}) {
   const beforeAsset = await runFlowStep('查询购买前余额', () => getCloudtentaclesAsset(payload))
   await sleep(350)
   const skuList = await runFlowStep('查询 SKU 列表', () => listCloudtentaclesSku(payload))
-  const targetSku = skuList.items.find((item) => Number(item.id || 0) === skuId) || null
+  const targetSku = skuList.items.find((item: JsonObject) => Number(item.id || 0) === skuId) || null
 
   if (!targetSku) {
     throw createHttpError(`cloudtentacles 未找到 SKU ${skuId}`, {
diff --git a/apps/backend/src/services/platforms/cloudtentacles/session-service.ts b/apps/backend/src/services/platforms/cloudtentacles/session-service.ts
index dc47a801..9afe2c75 100644
--- a/apps/backend/src/services/platforms/cloudtentacles/session-service.ts
+++ b/apps/backend/src/services/platforms/cloudtentacles/session-service.ts
@@ -176,7 +176,7 @@ export async function validateCloudtentaclesSession(payload: JsonObject = {}) {
     userInfo: isPlainObject(userInfoResult.payload?.data) ? userInfoResult.payload.data : {},
     asset: Number(assetResult.payload?.data || 0),
     permissions: Array.isArray(permissionResult.payload?.data)
-      ? permissionResult.payload.data.map((item) => String(item || '').trim()).filter(Boolean)
+      ? permissionResult.payload.data.map((item: unknown) => String(item || '').trim()).filter(Boolean)
       : [],
   }
 }
diff --git a/apps/backend/src/services/platforms/cloudtentacles/session-state-service.ts b/apps/backend/src/services/platforms/cloudtentacles/session-state-service.ts
index c55b7df3..412bb06d 100644
--- a/apps/backend/src/services/platforms/cloudtentacles/session-state-service.ts
+++ b/apps/backend/src/services/platforms/cloudtentacles/session-state-service.ts
@@ -6,6 +6,10 @@ import { PROJECT_ROOT } from '../../../config/runtime.js'
 const CLOUDTENTACLES_SESSION_FILE_PATH = path.join(PROJECT_ROOT, 'data', 'cloudtentacles-session.json')
 
 type JsonObject = Record<string, any>
+type CloudtentaclesSessionState = ReturnType<typeof createDefaultCloudtentaclesSessionState>
+type CloudtentaclesSessionStatesFile = {
+  sessions: Record<string, CloudtentaclesSessionState>
+}
 
 export function getCloudtentaclesSessionFilePath() {
   return CLOUDTENTACLES_SESSION_FILE_PATH
@@ -127,7 +131,7 @@ export function pruneCloudtentaclesSessionStates(sourceKeys: unknown[] = []) {
 // Internal helpers
 // ---------------------------------------------------------------------------
 
-function loadCloudtentaclesSessionStatesFromFile() {
+function loadCloudtentaclesSessionStatesFromFile(): CloudtentaclesSessionStatesFile {
   if (!fs.existsSync(CLOUDTENTACLES_SESSION_FILE_PATH)) {
     return createDefaultCloudtentaclesSessionStates()
   }
@@ -162,7 +166,7 @@ function normalizeCloudtentaclesSessionState(rawValue: unknown) {
  * Handles old format (single object without sessions key) by auto-wrapping
  * into { sessions: { 'default': ... } }.
  */
-function normalizeSessionStatesFile(rawValue: unknown) {
+function normalizeSessionStatesFile(rawValue: unknown): CloudtentaclesSessionStatesFile {
   // Old format: { token: 'xxx', ... } (single object, no sessions key)
   if (isPlainObject(rawValue) && !rawValue.sessions) {
     return {
@@ -194,7 +198,7 @@ function createDefaultCloudtentaclesSessionState() {
   }
 }
 
-function createDefaultCloudtentaclesSessionStates() {
+function createDefaultCloudtentaclesSessionStates(): CloudtentaclesSessionStatesFile {
   return {
     sessions: {
       'default': createDefaultCloudtentaclesSessionState(),
diff --git a/apps/backend/src/services/platforms/cloudtentacles/virtual-number-service.ts b/apps/backend/src/services/platforms/cloudtentacles/virtual-number-service.ts
index 9d2c3263..ab9380be 100644
--- a/apps/backend/src/services/platforms/cloudtentacles/virtual-number-service.ts
+++ b/apps/backend/src/services/platforms/cloudtentacles/virtual-number-service.ts
@@ -200,7 +200,7 @@ export async function probeCloudtentaclesBindUrl(payload: JsonObject = {}) {
       finalUrl: bindUrl,
       reason: 'missing_signature_params',
       roleInfo: normalizeAmsBindRoleInfo(null),
-      raw: null,
+      raw: null as null,
     }
   }
 
@@ -247,7 +247,7 @@ export async function probeCloudtentaclesBindUrl(payload: JsonObject = {}) {
       finalUrl: bindUrl,
       reason: error instanceof Error ? error.message : String(error || 'probe_failed'),
       roleInfo: normalizeAmsBindRoleInfo(null),
-      raw: null,
+      raw: null as null,
       durationMs: Date.now() - startedAt,
     }
   }
@@ -269,7 +269,7 @@ export async function getCloudtentaclesBindInfo(payload: JsonObject = {}) {
   })
 
   const items = Array.isArray(result.payload?.data) ? result.payload.data : []
-  const matchedItem = items.find((item) => Number(item?.id || 0) === id) || items[0] || {}
+  const matchedItem = items.find((item: JsonObject) => Number(item?.id || 0) === id) || items[0] || {}
   const bindInfo = parseBindInfo(matchedItem?.bind_info)
 
   return {
diff --git a/apps/backend/src/services/platforms/ninetyone/order-service.ts b/apps/backend/src/services/platforms/ninetyone/order-service.ts
index 797fa4d8..6e6f6af5 100644
--- a/apps/backend/src/services/platforms/ninetyone/order-service.ts
+++ b/apps/backend/src/services/platforms/ninetyone/order-service.ts
@@ -11,6 +11,7 @@ import {
 } from '../../open-91/shared.js'
 import { createHttpError } from '../../../utils/http.js'
 import { nowIso } from '../../../utils/time.js'
+import type { OrderItemRow, OrderRow } from '../../../types/repository-rows.js'
 
 export const OPEN_91_PENDING_CONFIG_STATUS = 'pending_config'
 export const OPEN_91_MANUAL_FAILED_STATUS = 'manual_failed'
@@ -68,7 +69,7 @@ export function buildOpen91SourceEvent(payload: JsonObject = {}, config: JsonObj
   }
 }
 
-export async function upsertOpen91PendingOrder(payload = {}, config = {}) {
+export async function upsertOpen91PendingOrder(payload: JsonObject = {}, config: JsonObject = {}) {
   const event = buildOpen91SourceEvent(payload, config)
   const now = nowIso()
   const existing = await findOrderByPlatformOrderId({
@@ -127,11 +128,11 @@ export async function upsertOpen91PendingOrder(payload = {}, config = {}) {
   return {
     order,
     orderItems,
-    tasks: [],
+    tasks: [] as JsonObject[],
   }
 }
 
-export async function retryOpen91Order(orderId) {
+export async function retryOpen91Order(orderId: string | number) {
   const order = await getRequiredOpen91Order(orderId)
   const items = await listOrderItemsByOrderId(order.id)
   const event = buildOpen91SourceEventFromOrder(order, items)
@@ -154,7 +155,7 @@ export async function retryOpen91Order(orderId) {
   }
 }
 
-export async function failOpen91Order(orderId, reason = '') {
+export async function failOpen91Order(orderId: string | number, reason = '') {
   const order = await getRequiredOpen91Order(orderId)
   const now = nowIso()
   const rawPayload = parseJsonObject(order.raw_payload_json)
@@ -245,7 +246,7 @@ export async function listOpen91Orders({ page = 1, pageSize = 20, status = 'pend
   }
 }
 
-export async function getRequiredOpen91Order(orderId) {
+export async function getRequiredOpen91Order(orderId: string | number) {
   const order = await getOrderById(Number(orderId))
 
   if (!order || order.provider !== OPEN_91_PROVIDER || order.platform !== OPEN_91_PLATFORM) {
@@ -258,11 +259,11 @@ export async function getRequiredOpen91Order(orderId) {
   return order
 }
 
-function buildOpen91SourceEventFromOrder(order, items = []) {
+function buildOpen91SourceEventFromOrder(order: OrderRow, items: OrderItemRow[] = []) {
   const rawPayload = parseJsonObject(order.raw_payload_json)
   const body = parseJsonObject(rawPayload.body)
   const normalizedItems = Array.isArray(items) ? items : []
-  const eventItems = normalizedItems.map((item) => {
+  const eventItems = normalizedItems.map((item: OrderItemRow) => {
     const snapshot = parseJsonObject(item.item_snapshot_json)
     const productNo = String(snapshot.productNo || snapshot.externalSkuCode || item.sku_code || '').trim()
 
@@ -301,7 +302,7 @@ function buildOpen91SourceEventFromOrder(order, items = []) {
   }
 }
 
-function mapOpen91AdminOrderRow(row) {
+function mapOpen91AdminOrderRow(row: JsonObject) {
   const rawPayload = parseJsonObject(row.raw_payload_json)
   const items = Array.isArray(row.items_json) ? row.items_json : []
   const firstItem = items[0] || {}
@@ -327,7 +328,7 @@ function mapOpen91AdminOrderRow(row) {
   }
 }
 
-function parseJsonObject(value) {
+function parseJsonObject(value: unknown): JsonObject {
   if (!value) {
     return {}
   }
diff --git a/apps/backend/src/services/scheduler/cloudtentacles-health-job.ts b/apps/backend/src/services/scheduler/cloudtentacles-health-job.ts
index 57083d3e..a759e859 100644
--- a/apps/backend/src/services/scheduler/cloudtentacles-health-job.ts
+++ b/apps/backend/src/services/scheduler/cloudtentacles-health-job.ts
@@ -65,7 +65,7 @@ async function runCloudtentaclesHealthAccount(
 ): Promise<CloudtentaclesHealthAccountResult> {
   const sourceKey = String(account.sourceKey || '').trim() || 'default'
   const source = getCloudtentaclesSourceByKey(sourceKey)
-  const session = getCloudtentaclesSessionStateByKey(sourceKey) || {}
+  const session: JsonObject = getCloudtentaclesSessionStateByKey(sourceKey) || {}
   const label = String(account.label || source?.label || source?.username || sourceKey).trim() || sourceKey
   const threshold = normalizeNonNegativeInteger(account.assetThreshold, 500)
   const checkedAt = new Date().toISOString()
diff --git a/apps/backend/src/startup/state.ts b/apps/backend/src/startup/state.ts
index 2f0de5f9..53f36847 100644
--- a/apps/backend/src/startup/state.ts
+++ b/apps/backend/src/startup/state.ts
@@ -1,6 +1,26 @@
-export type StartupState = ReturnType<typeof createStartupState>;
+type StartupProcessError = {
+  time: string;
+  message: string;
+};
 
-export function createStartupState() {
+export type StartupState = {
+  phase: string;
+  startedAt: string;
+  core: {
+    ready: boolean;
+    running: boolean;
+    attemptCount: number;
+    readyAt: string;
+    lastAttemptAt: string;
+    lastError: string;
+  };
+  process: {
+    lastUnhandledRejection: StartupProcessError | null;
+    lastUncaughtException: StartupProcessError | null;
+  };
+};
+
+export function createStartupState(): StartupState {
   return {
     phase: "starting",
     startedAt: new Date().toISOString(),
diff --git a/apps/backend/src/utils/http.ts b/apps/backend/src/utils/http.ts
index 7a83dcf5..15c9f918 100644
--- a/apps/backend/src/utils/http.ts
+++ b/apps/backend/src/utils/http.ts
@@ -29,13 +29,16 @@ export function buildSuccessPayload(data: unknown, msg: string = "ok") {
 
 export function buildErrorPayload(error: unknown, fallbackMessage: string) {
   const classification = classifyRouteError(error);
+  const message = classification.statusCode >= 500
+    ? fallbackMessage || "服务内部错误"
+    : error instanceof Error ? error.message : fallbackMessage;
 
   return {
     code: 1,
-    msg: error instanceof Error ? error.message : fallbackMessage,
+    msg: message,
     errorCode: classification.errorCode,
     time: Math.floor(Date.now() / 1000),
-    data: null,
+    data: null as null,
   };
 }
 
@@ -62,7 +65,7 @@ export function buildNotFoundPayload(req: Request) {
     code: 1,
     msg: `未实现接口: ${req.method} ${req.originalUrl}`,
     time: Math.floor(Date.now() / 1000),
-    data: null,
+    data: null as null,
   };
 }
 
diff --git a/apps/backend/src/utils/logger.test.ts b/apps/backend/src/utils/logger.test.ts
index b9d53227..dfe5efe2 100644
--- a/apps/backend/src/utils/logger.test.ts
+++ b/apps/backend/src/utils/logger.test.ts
@@ -102,3 +102,27 @@ test('formatLogEntry prints nested detail blocks without ansi colors in file mod
   assert.match(text, /未登录或登录已失效/)
   assert.doesNotMatch(text, /\u001B\[/)
 })
+
+test('formatLogEntry masks sensitive fields in inline and nested details', () => {
+  const text = formatLogEntry({
+    time: '2026-04-14T10:36:24.974Z',
+    level: 'info',
+    scope: '[security]',
+    message: 'masked',
+    pid: 4671,
+    detail: {
+      token: 'abcdef1234567890',
+      authorization: 'Bearer abcdef1234567890',
+      nested: {
+        cookie: 'sessionid=abcdef1234567890',
+        note: 'password=super-secret-value',
+      },
+    },
+  }, { color: false })
+
+  assert.doesNotMatch(text, /abcdef1234567890/)
+  assert.doesNotMatch(text, /super-secret-value/)
+  assert.match(text, /abcdef\*\*\*\*567890/)
+  assert.match(text, /Bearer\*\*\*\*567890/)
+  assert.match(text, /password=super-\*\*\*\*-value/)
+})
diff --git a/apps/backend/src/utils/logger.ts b/apps/backend/src/utils/logger.ts
index 5f3680fe..ee0f9a8a 100644
--- a/apps/backend/src/utils/logger.ts
+++ b/apps/backend/src/utils/logger.ts
@@ -5,15 +5,29 @@ import util from 'node:util'
 
 import { PROJECT_ROOT, runtimeConfig } from '../config/runtime.js'
 import type { HttpErrorLike } from './http.js'
+import { maskSecret } from './masking.js'
 
-const LOG_LEVEL_PRIORITY = {
+type LogLevel = 'debug' | 'info' | 'warn' | 'error'
+type LogChannel = 'app' | 'integration'
+type LogDetail = unknown
+type InlineFields = Record<string, string | number | boolean | null | undefined>
+type LogEntry = {
+  time: string
+  level: LogLevel
+  scope: string
+  message: string
+  pid: number
+  detail?: unknown
+}
+
+const LOG_LEVEL_PRIORITY: Record<LogLevel, number> = {
   debug: 10,
   info: 20,
   warn: 30,
   error: 40,
 }
 
-const LEVEL_LABELS = {
+const LEVEL_LABELS: Record<LogLevel, string> = {
   debug: 'DEBUG',
   info: 'INFO ',
   warn: 'WARN ',
@@ -36,35 +50,48 @@ const LOG_DIR = path.join(DATA_ROOT, 'logs')
 const ACTIVE_LOG_LEVEL = normalizeLogLevel(runtimeConfig.logging?.level)
 const LOG_RETENTION_DAYS = 7
 const LEGACY_LOG_FILES = new Set(['app.log', 'integration.log'])
+const SENSITIVE_KEY_PATTERN = /token|secret|password|passwd|pwd|cookie|authorization|credential|card|cards|cardno|cardpwd|apikey|api_key|devicekey|session/i
+const MAX_SANITIZE_DEPTH = 8
 
 let writeQueue = Promise.resolve()
 let lastCleanupDateKey = ''
 
-export function createRequestId(prefix = 'req') {
+export function createRequestId(prefix = 'req'): string {
   return `${prefix}-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 8)}`
 }
 
-export function logDebug(scope, message, detail = undefined) {
+export function logDebug(scope: unknown, message: unknown, detail: LogDetail = undefined) {
   return writeLog('debug', scope, message, detail)
 }
 
-export function logInfo(scope, message, detail = undefined) {
+export function logInfo(scope: unknown, message: unknown, detail: LogDetail = undefined) {
   return writeLog('info', scope, message, detail)
 }
 
-export function logWarn(scope, message, detail = undefined) {
+export function logWarn(scope: unknown, message: unknown, detail: LogDetail = undefined) {
   return writeLog('warn', scope, message, detail)
 }
 
-export function logError(scope, message, detail = undefined) {
+export function logError(scope: unknown, message: unknown, detail: LogDetail = undefined) {
   return writeLog('error', scope, message, detail)
 }
 
-export function logIntegration(scope, message, detail = undefined, { level = 'info' } = {}) {
+export function logIntegration(
+  scope: unknown,
+  message: unknown,
+  detail: LogDetail = undefined,
+  { level = 'info' }: { level?: LogLevel } = {},
+) {
   return writeLog(level, scope, message, detail, { channel: 'integration' })
 }
 
-function writeLog(level, scope, message, detail, { channel = 'app' } = {}) {
+function writeLog(
+  level: LogLevel,
+  scope: unknown,
+  message: unknown,
+  detail: LogDetail,
+  { channel = 'app' }: { channel?: LogChannel } = {},
+): LogEntry | null {
   if (!shouldWriteLog(level, ACTIVE_LOG_LEVEL)) {
     return null
   }
@@ -83,7 +110,7 @@ function writeLog(level, scope, message, detail, { channel = 'app' } = {}) {
   return entry
 }
 
-function enqueueFileWrite(entry, filePath) {
+function enqueueFileWrite(entry: LogEntry, filePath: string): void {
   const line = formatLogEntry(entry, { color: false })
   const dateKey = extractLogDateKey(entry.time)
 
@@ -99,12 +126,12 @@ function enqueueFileWrite(entry, filePath) {
     })
 }
 
-function writeConsole(entry) {
+function writeConsole(entry: LogEntry): void {
   const logger = resolveConsoleMethod(entry.level)
   logger(formatLogEntry(entry, { color: supportsAnsiColor() }))
 }
 
-function resolveConsoleMethod(level) {
+function resolveConsoleMethod(level: unknown) {
   const normalized = normalizeLogLevel(level)
 
   if (normalized === 'error') {
@@ -118,26 +145,26 @@ function resolveConsoleMethod(level) {
   return console.log
 }
 
-export function normalizeLogLevel(level) {
+export function normalizeLogLevel(level: unknown): LogLevel {
   const normalized = String(level || '').trim().toLowerCase()
-  return LOG_LEVEL_PRIORITY[normalized] != null ? normalized : 'info'
+  return isLogLevel(normalized) ? normalized : 'info'
 }
 
-export function shouldWriteLog(level, configuredLevel = ACTIVE_LOG_LEVEL) {
+export function shouldWriteLog(level: unknown, configuredLevel: unknown = ACTIVE_LOG_LEVEL): boolean {
   const normalizedLevel = normalizeLogLevel(level)
   const normalizedConfigured = normalizeLogLevel(configuredLevel)
 
   return LOG_LEVEL_PRIORITY[normalizedLevel] >= LOG_LEVEL_PRIORITY[normalizedConfigured]
 }
 
-export function formatLogEntry(entry, { color = false } = {}) {
+export function formatLogEntry(entry: Partial<LogEntry>, { color = false }: { color?: boolean } = {}): string {
   const normalizedEntry = {
     time: String(entry?.time || new Date().toISOString()),
     level: normalizeLogLevel(entry?.level),
     scope: String(entry?.scope || 'app').trim() || 'app',
     message: String(entry?.message || '').trim() || '-',
     pid: Number(entry?.pid || process.pid),
-    detail: entry?.detail,
+    detail: sanitizeLogValue(entry?.detail),
   }
   const timestamp = colorize(formatLogTimestamp(normalizedEntry.time), ANSI.gray, color)
   const level = colorize(LEVEL_LABELS[normalizedEntry.level], resolveLevelColor(normalizedEntry.level), color)
@@ -166,16 +193,16 @@ export function formatLogEntry(entry, { color = false } = {}) {
   return `${firstLine}\n${indentBlock(inspected, '  ')}`
 }
 
-export function resolveLogFilePath(channel = 'app', time = new Date().toISOString()) {
+export function resolveLogFilePath(channel = 'app', time = new Date().toISOString()): string {
   const normalizedChannel = String(channel || '').trim() === 'integration' ? 'integration' : 'app'
   return path.join(LOG_DIR, `${normalizedChannel}-${extractLogDateKey(time)}.log`)
 }
 
 export function resolveExpiredLogFilenames(
-  fileNames = [],
+  fileNames: string[] = [],
   referenceTime = new Date().toISOString(),
   retentionDays = LOG_RETENTION_DAYS,
-) {
+): string[] {
   const normalizedRetentionDays = Math.max(1, Number(retentionDays) || LOG_RETENTION_DAYS)
   const cutoffDateKey = toDateKey(offsetDate(referenceTime, -(normalizedRetentionDays - 1)))
 
@@ -183,8 +210,8 @@ export function resolveExpiredLogFilenames(
     .filter((fileName) => shouldDeleteLogFileByDate(fileName, cutoffDateKey))
 }
 
-export function formatLogTimestamp(value) {
-  const date = new Date(value)
+export function formatLogTimestamp(value: unknown): string {
+  const date = new Date(value instanceof Date ? value : String(value || ''))
 
   if (Number.isNaN(date.getTime())) {
     return String(value || '').trim() || new Date().toISOString()
@@ -193,27 +220,28 @@ export function formatLogTimestamp(value) {
   return `${formatLocalDate(date)} ${formatLocalTime(date)}.${String(date.getMilliseconds()).padStart(3, '0')} ${formatTimezoneOffset(date)}`
 }
 
-function resolveDataRoot() {
+function resolveDataRoot(): string {
   const configured = String(runtimeConfig.data?.root || '').trim()
   return configured ? path.resolve(configured) : path.resolve(PROJECT_ROOT, 'data')
 }
 
-function normalizeLogValue(value) {
+function normalizeLogValue(value: unknown): unknown {
   if (typeof value === 'undefined') {
     return undefined
   }
 
   try {
-    return JSON.parse(
+    return sanitizeLogValue(JSON.parse(
       JSON.stringify(value, (_key, current) => {
         if (current instanceof Error) {
           const currentError = current as Error & HttpErrorLike
           return {
             name: current.name,
-            message: current.message,
-            stack: current.stack,
+            message: sanitizeLogString(current.message),
+            stack: sanitizeLogString(current.stack),
             statusCode: currentError.statusCode,
             errorCode: currentError.errorCode,
+            context: sanitizeLogValue(currentError.context),
           }
         }
 
@@ -223,13 +251,71 @@ function normalizeLogValue(value) {
 
         return current
       }),
-    )
+    ))
   } catch {
-    return String(value)
+    return sanitizeLogString(String(value))
   }
 }
 
-function splitDetailPayload(detail) {
+function sanitizeLogValue(value: unknown, key = '', depth = 0): unknown {
+  if (typeof value === 'undefined') {
+    return undefined
+  }
+
+  if (value === null) {
+    return null
+  }
+
+  if (isSensitiveLogKey(key)) {
+    return maskSecret(value)
+  }
+
+  if (typeof value === 'string') {
+    return sanitizeLogString(value)
+  }
+
+  if (typeof value === 'number' || typeof value === 'boolean') {
+    return value
+  }
+
+  if (typeof value === 'bigint') {
+    return String(value)
+  }
+
+  if (depth >= MAX_SANITIZE_DEPTH) {
+    return '[MaxDepth]'
+  }
+
+  if (Array.isArray(value)) {
+    return value.map((item) => sanitizeLogValue(item, key, depth + 1))
+  }
+
+  if (value && typeof value === 'object') {
+    return Object.fromEntries(
+      Object.entries(value).map(([currentKey, currentValue]) => [
+        currentKey,
+        sanitizeLogValue(currentValue, currentKey, depth + 1),
+      ]),
+    )
+  }
+
+  return sanitizeLogString(String(value))
+}
+
+function sanitizeLogString(value: unknown): string {
+  return String(value || '')
+    .replace(/(Bearer\s+)([A-Za-z0-9._~+/=-]+)/gi, (_matched, prefix, secret) => `${prefix}${maskSecret(secret)}`)
+    .replace(
+      /\b((?:token|secret|password|passwd|pwd|cookie|authorization|api[_-]?key|device[_-]?key)=)([^&\s,;]+)/gi,
+      (_matched, prefix, secret) => `${prefix}${maskSecret(secret)}`,
+    )
+}
+
+function isSensitiveLogKey(key: unknown): boolean {
+  return SENSITIVE_KEY_PATTERN.test(String(key || '').trim())
+}
+
+function splitDetailPayload(detail: unknown): { inline: InlineFields, block: unknown | null } {
   if (typeof detail === 'undefined') {
     return {
       inline: {},
@@ -252,8 +338,8 @@ function splitDetailPayload(detail) {
   }
 
   if (detail && typeof detail === 'object') {
-    const inline = {}
-    const block = {}
+    const inline: InlineFields = {}
+    const block: Record<string, unknown> = {}
 
     for (const [key, value] of Object.entries(detail)) {
       if (isScalarLogValue(value)) {
@@ -276,14 +362,14 @@ function splitDetailPayload(detail) {
   }
 }
 
-function formatInlineFields(fields) {
+function formatInlineFields(fields: InlineFields): string {
   return Object.entries(fields)
     .filter(([, value]) => typeof value !== 'undefined' && value !== '')
     .map(([key, value]) => `${key}=${formatInlineValue(value)}`)
     .join(' ')
 }
 
-function formatInlineValue(value) {
+function formatInlineValue(value: unknown): string {
   if (value === null) {
     return 'null'
   }
@@ -296,22 +382,22 @@ function formatInlineValue(value) {
   return /^[A-Za-z0-9_./:@-]+$/.test(text) ? text : JSON.stringify(text)
 }
 
-function isScalarLogValue(value) {
+function isScalarLogValue(value: unknown): value is string | number | boolean | null {
   return value === null || ['string', 'number', 'boolean'].includes(typeof value)
 }
 
-function indentBlock(text, indent) {
+function indentBlock(text: unknown, indent: string): string {
   return String(text || '')
     .split('\n')
     .map((line) => `${indent}${line}`)
     .join('\n')
 }
 
-function supportsAnsiColor() {
+function supportsAnsiColor(): boolean {
   return process.env.NO_COLOR !== '1' && Boolean(process.stdout.isTTY || process.stderr.isTTY)
 }
 
-function resolveLevelColor(level) {
+function resolveLevelColor(level: unknown): string {
   switch (normalizeLogLevel(level)) {
     case 'debug':
       return ANSI.blue
@@ -324,7 +410,7 @@ function resolveLevelColor(level) {
   }
 }
 
-function colorize(text, ansiCode, enabled) {
+function colorize(text: string, ansiCode: string, enabled: boolean): string {
   if (!enabled || !ansiCode) {
     return text
   }
@@ -332,15 +418,15 @@ function colorize(text, ansiCode, enabled) {
   return `${ansiCode}${text}${ANSI.reset}`
 }
 
-function formatLocalDate(date) {
+function formatLocalDate(date: Date): string {
   return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')}`
 }
 
-function formatLocalTime(date) {
+function formatLocalTime(date: Date): string {
   return `${String(date.getHours()).padStart(2, '0')}:${String(date.getMinutes()).padStart(2, '0')}:${String(date.getSeconds()).padStart(2, '0')}`
 }
 
-function formatTimezoneOffset(date) {
+function formatTimezoneOffset(date: Date): string {
   const totalMinutes = -date.getTimezoneOffset()
   const sign = totalMinutes >= 0 ? '+' : '-'
   const absoluteMinutes = Math.abs(totalMinutes)
@@ -349,7 +435,7 @@ function formatTimezoneOffset(date) {
   return `${sign}${hours}:${minutes}`
 }
 
-async function cleanupExpiredLogsIfNeeded(dateKey) {
+async function cleanupExpiredLogsIfNeeded(dateKey: string): Promise<void> {
   if (!dateKey || dateKey === lastCleanupDateKey) {
     return
   }
@@ -366,13 +452,13 @@ async function cleanupExpiredLogsIfNeeded(dateKey) {
   }
 }
 
-function extractLogDateKey(time) {
+function extractLogDateKey(time: unknown): string {
   const normalized = String(time || '').trim()
   return /^\d{4}-\d{2}-\d{2}/.test(normalized) ? normalized.slice(0, 10) : toDateKey(normalized)
 }
 
-function toDateKey(value) {
-  const date = new Date(value)
+function toDateKey(value: unknown): string {
+  const date = new Date(value instanceof Date ? value : String(value || ''))
 
   if (Number.isNaN(date.getTime())) {
     return new Date().toISOString().slice(0, 10)
@@ -381,13 +467,13 @@ function toDateKey(value) {
   return date.toISOString().slice(0, 10)
 }
 
-function offsetDate(value, offsetDays) {
-  const date = new Date(value)
+function offsetDate(value: unknown, offsetDays: unknown): Date {
+  const date = new Date(value instanceof Date ? value : String(value || ''))
   date.setUTCDate(date.getUTCDate() + Number(offsetDays || 0))
   return date
 }
 
-function shouldDeleteLogFileByDate(fileName, cutoffDateKey) {
+function shouldDeleteLogFileByDate(fileName: unknown, cutoffDateKey: string): boolean {
   if (LEGACY_LOG_FILES.has(String(fileName || '').trim())) {
     return true
   }
@@ -398,5 +484,9 @@ function shouldDeleteLogFileByDate(fileName, cutoffDateKey) {
     return false
   }
 
-  return matched[2] < cutoffDateKey
+  return String(matched[2] || '') < cutoffDateKey
+}
+
+function isLogLevel(value: string): value is LogLevel {
+  return ['debug', 'info', 'warn', 'error'].includes(value)
 }
diff --git a/apps/backend/tsconfig.json b/apps/backend/tsconfig.json
index a0fdbe5b..cb7c5ef6 100644
--- a/apps/backend/tsconfig.json
+++ b/apps/backend/tsconfig.json
@@ -7,6 +7,7 @@
     "checkJs": true,
     "noEmit": true,
     "strict": false,
+    "noImplicitAny": true,
     "skipLibCheck": true,
     "types": ["node"],
     "lib": ["ES2022"]
diff --git a/apps/frontend/src/lib/http.ts b/apps/frontend/src/lib/http.ts
index 13e55903..dfb08252 100644
--- a/apps/frontend/src/lib/http.ts
+++ b/apps/frontend/src/lib/http.ts
@@ -106,6 +106,7 @@ function shouldClearAdminSession(errorCode: string) {
     'admin_auth_invalid',
     'admin_auth_expired',
     'admin_auth_user_invalid',
+    'admin_auth_stale',
   ].includes(errorCode)
 }