diff --git a/apps/backend/src/services/admin/admin-auth-service.js b/apps/backend/src/services/admin/admin-auth-service.ts
similarity index 80%
rename from apps/backend/src/services/admin/admin-auth-service.js
rename to apps/backend/src/services/admin/admin-auth-service.ts
index 6a4a63af..4a1d3058 100644
--- a/apps/backend/src/services/admin/admin-auth-service.js
+++ b/apps/backend/src/services/admin/admin-auth-service.ts
@@ -14,7 +14,23 @@ import { addHours, nowIso } from '../../utils/time.js'
 import { createHttpError } from '../../utils/http.js'
 import { normalizePage, normalizePageSize } from './admin-query-utils.js'
 
-export async function ensureAdminUsersBootstrapped() {
+type AdminUserRow = NonNullable<Awaited<ReturnType<typeof getAdminUserById>>>
+
+type JsonObject = Record<string, any>
+
+type AdminSession = {
+  sessionId: string
+  userId: number
+  username: string
+  role: AdminRole
+  allowedInventoryGroups: string[]
+  expiresAt: string
+}
+
+type AdminRole = 'admin' | 'operator' | 'support'
+type AdminUserStatus = 'active' | 'disabled'
+
+export async function ensureAdminUsersBootstrapped(): Promise<void> {
   ensureAdminAuthConfigured()
 
   const configuredUsers = Array.isArray(runtimeConfig.admin?.defaultUsers) ? runtimeConfig.admin.defaultUsers : []
@@ -44,7 +60,7 @@ export async function ensureAdminUsersBootstrapped() {
   }
 }
 
-export async function loginAdmin(username, password) {
+export async function loginAdmin(username: unknown, password: unknown): Promise<JsonObject> {
   ensureAdminAuthConfigured()
 
   const normalizedUsername = String(username || '').trim().toLowerCase()
@@ -68,7 +84,7 @@ export async function loginAdmin(username, password) {
   return createAdminSession(user)
 }
 
-export async function verifyAdminSessionToken(token) {
+export async function verifyAdminSessionToken(token: unknown): Promise<AdminSession> {
   ensureAdminAuthConfigured()
 
   const normalizedToken = String(token || '').trim()
@@ -95,7 +111,7 @@ export async function verifyAdminSessionToken(token) {
     })
   }
 
-  let payload = null
+  let payload: JsonObject | null = null
 
   try {
     payload = JSON.parse(Buffer.from(encodedPayload, 'base64url').toString('utf8'))
@@ -133,7 +149,7 @@ export async function verifyAdminSessionToken(token) {
   }
 }
 
-export async function getAdminSessionSummary(token) {
+export async function getAdminSessionSummary(token: unknown): Promise<JsonObject> {
   const session = await verifyAdminSessionToken(token)
 
   return {
@@ -148,7 +164,7 @@ export async function getAdminSessionSummary(token) {
   }
 }
 
-export function requireAdminRole(session, allowedRoles) {
+export function requireAdminRole(session: { role?: string }, allowedRoles: string[]): void {
   if (allowedRoles.includes(session.role)) {
     return
   }
@@ -159,7 +175,7 @@ export function requireAdminRole(session, allowedRoles) {
   })
 }
 
-export async function getAdminUserList(query = {}) {
+export async function getAdminUserList(query: JsonObject = {}): Promise<JsonObject> {
   const page = normalizePage(query.page)
   const pageSize = normalizePageSize(query.pageSize)
   const { items, total } = await listAdminUsers({
@@ -176,7 +192,7 @@ export async function getAdminUserList(query = {}) {
   }
 }
 
-export async function createManagedAdminUser(payload = {}) {
+export async function createManagedAdminUser(payload: JsonObject = {}): Promise<JsonObject> {
   const username = normalizeUsername(payload.username)
   const password = normalizePassword(payload.password)
 
@@ -219,7 +235,11 @@ export async function createManagedAdminUser(payload = {}) {
   }
 }
 
-export async function updateManagedAdminUserInventoryGroups(userId, payload = {}, session) {
+export async function updateManagedAdminUserInventoryGroups(
+  userId: number | string,
+  payload: JsonObject = {},
+  session: AdminSession,
+): Promise<JsonObject> {
   const user = await getRequiredAdminUser(userId)
   const inventoryGroupCodes = normalizeInventoryGroupCodes(payload.inventoryGroupCodes)
 
@@ -231,7 +251,11 @@ export async function updateManagedAdminUserInventoryGroups(userId, payload = {}
   }
 }
 
-export async function updateManagedAdminUserRole(userId, payload = {}, session) {
+export async function updateManagedAdminUserRole(
+  userId: number | string,
+  payload: JsonObject = {},
+  session: AdminSession,
+): Promise<JsonObject> {
   const user = await getRequiredAdminUser(userId)
   const role = normalizeAdminRole(payload.role)
 
@@ -252,7 +276,11 @@ export async function updateManagedAdminUserRole(userId, payload = {}, session)
   }
 }
 
-export async function updateManagedAdminUserStatus(userId, payload = {}, session) {
+export async function updateManagedAdminUserStatus(
+  userId: number | string,
+  payload: JsonObject = {},
+  session: AdminSession,
+): Promise<JsonObject> {
   const user = await getRequiredAdminUser(userId)
   const status = normalizeAdminUserStatus(payload.status)
 
@@ -273,7 +301,7 @@ export async function updateManagedAdminUserStatus(userId, payload = {}, session
   }
 }
 
-export async function resetManagedAdminUserPassword(userId, payload = {}) {
+export async function resetManagedAdminUserPassword(userId: number | string, payload: JsonObject = {}): Promise<JsonObject> {
   const user = await getRequiredAdminUser(userId)
   const password = normalizePassword(payload.password)
 
@@ -295,7 +323,7 @@ export async function resetManagedAdminUserPassword(userId, payload = {}) {
   }
 }
 
-export function ensureAdminAuthConfigured() {
+export function ensureAdminAuthConfigured(): void {
   const sessionSecret = String(runtimeConfig.admin?.sessionSecret || '').trim()
   const configuredUsers = Array.isArray(runtimeConfig.admin?.defaultUsers) ? runtimeConfig.admin.defaultUsers : []
 
@@ -309,7 +337,7 @@ export function ensureAdminAuthConfigured() {
   })
 }
 
-function createAdminSession(user) {
+function createAdminSession(user: AdminUserRow): JsonObject {
   const issuedAt = nowIso()
   const expiresAt = addHours(issuedAt, Number(runtimeConfig.admin.sessionTtlHours || 12))
   const payload = {
@@ -335,13 +363,13 @@ function createAdminSession(user) {
   }
 }
 
-export function hashAdminPassword(password) {
+export function hashAdminPassword(password: string): string {
   const salt = crypto.randomBytes(16).toString('hex')
   const derived = crypto.scryptSync(password, salt, 64).toString('hex')
   return `scrypt$${salt}$${derived}`
 }
 
-function verifyAdminPassword(password, storedHash) {
+function verifyAdminPassword(password: string, storedHash: string): boolean {
   const [algorithm, salt, expectedHash] = String(storedHash || '').split('$')
   if (algorithm !== 'scrypt' || !salt || !expectedHash) {
     return false
@@ -351,14 +379,14 @@ function verifyAdminPassword(password, storedHash) {
   return safeCompare(actualHash, expectedHash)
 }
 
-function signPayload(encodedPayload) {
+function signPayload(encodedPayload: string): string {
   return crypto
     .createHmac('sha256', String(runtimeConfig.admin.sessionSecret || ''))
     .update(encodedPayload)
     .digest('base64url')
 }
 
-export function normalizeAdminRole(role) {
+export function normalizeAdminRole(role: unknown): AdminRole {
   const normalized = String(role || '').trim().toLowerCase()
 
   if (normalized === 'admin') {
@@ -372,11 +400,11 @@ export function normalizeAdminRole(role) {
   return 'operator'
 }
 
-export function normalizeAdminUserStatus(status) {
+export function normalizeAdminUserStatus(status: unknown): AdminUserStatus {
   return String(status || '').trim().toLowerCase() === 'disabled' ? 'disabled' : 'active'
 }
 
-function safeCompare(input, expected) {
+function safeCompare(input: unknown, expected: unknown): boolean {
   const left = Buffer.from(String(input || ''), 'utf8')
   const right = Buffer.from(String(expected || ''), 'utf8')
 
@@ -387,25 +415,25 @@ function safeCompare(input, expected) {
   return crypto.timingSafeEqual(left, right)
 }
 
-function normalizeRoleQuery(role) {
+function normalizeRoleQuery(role: unknown): string {
   const normalized = String(role || '').trim().toLowerCase()
   return ['admin', 'operator', 'support'].includes(normalized) ? normalized : ''
 }
 
-function normalizeStatusQuery(status) {
+function normalizeStatusQuery(status: unknown): string {
   const normalized = String(status || '').trim().toLowerCase()
   return ['active', 'disabled'].includes(normalized) ? normalized : ''
 }
 
-function normalizeUsername(username) {
+function normalizeUsername(username: unknown): string {
   return String(username || '').trim().toLowerCase()
 }
 
-function normalizePassword(password) {
+function normalizePassword(password: unknown): string {
   return String(password || '').trim()
 }
 
-function validateUsername(username) {
+function validateUsername(username: string): void {
   if (!/^[a-zA-Z0-9._-]{3,32}$/.test(username)) {
     throw createHttpError('后台账号格式无效，需为 3-32 位字母数字或 ._-', {
       statusCode: 400,
@@ -414,7 +442,7 @@ function validateUsername(username) {
   }
 }
 
-function validatePassword(password) {
+function validatePassword(password: string): void {
   if (password.length < 8) {
     throw createHttpError('后台密码至少 8 位', {
       statusCode: 400,
@@ -423,7 +451,7 @@ function validatePassword(password) {
   }
 }
 
-async function getRequiredAdminUser(userId) {
+async function getRequiredAdminUser(userId: number | string): Promise<AdminUserRow> {
   const user = await getAdminUserById(Number(userId))
 
   if (!user) {
@@ -436,7 +464,11 @@ async function getRequiredAdminUser(userId) {
   return user
 }
 
-async function ensureAdminUserChangeAllowed(user, options = {}, session) {
+async function ensureAdminUserChangeAllowed(
+  user: AdminUserRow,
+  options: { nextRole?: AdminRole, nextStatus?: AdminUserStatus } = {},
+  session: AdminSession,
+): Promise<void> {
   const nextRole = options.nextRole || user.role
   const nextStatus = options.nextStatus || user.status
 
@@ -455,7 +487,7 @@ async function ensureAdminUserChangeAllowed(user, options = {}, session) {
   }
 }
 
-function mapAdminUser(user) {
+function mapAdminUser(user: AdminUserRow | null): JsonObject {
   return {
     userId: Number(user.id),
     username: String(user.username || ''),
@@ -467,7 +499,7 @@ function mapAdminUser(user) {
   }
 }
 
-function normalizeInventoryGroupCodes(values) {
+function normalizeInventoryGroupCodes(values: unknown): string[] {
   return Array.from(new Set((Array.isArray(values) ? values : [])
     .map((value) => String(value || '').trim())
     .filter(Boolean)))
diff --git a/apps/backend/src/services/admin/admin-manual-redeem-service.js b/apps/backend/src/services/admin/admin-manual-redeem-service.ts
similarity index 85%
rename from apps/backend/src/services/admin/admin-manual-redeem-service.js
rename to apps/backend/src/services/admin/admin-manual-redeem-service.ts
index 58e03233..bd58651a 100644
--- a/apps/backend/src/services/admin/admin-manual-redeem-service.js
+++ b/apps/backend/src/services/admin/admin-manual-redeem-service.ts
@@ -21,21 +21,24 @@ import { randomId } from '../../utils/random.js'
 import { closeAdminTask, confirmAdminTaskAssistedRole, redeemAdminTaskAssisted } from './admin-write-service.js'
 import { createAdminViewerContext, isAssistedClaimTask, parseTaskContext } from './admin-read-shared-helpers.js'
 
+import type {
+  AdminEntityIdInput,
+  AdminViewerSessionInput,
+} from '../../types/admin-read-inputs.js'
+import type { AdminManualRedeemCreateInput } from '../../types/admin-write-inputs.js'
+import type { TaskRow } from '../../types/repository-rows.js'
+
 const MANUAL_PROVIDER = 'manual'
 const MANUAL_PLATFORM = 'manual_redeem'
 const MANUAL_SOURCE_TYPE = 'admin_manual_redeem'
 const ASSISTED_PROFILE_KEY = 'tencent_claim_assisted'
 
-/** @typedef {import('../../types/admin-read-inputs.js').AdminEntityIdInput} AdminEntityIdInput */
-/** @typedef {import('../../types/admin-read-inputs.js').AdminViewerSessionInput} AdminViewerSessionInput */
-/** @typedef {import('../../types/admin-write-inputs.js').AdminManualRedeemCreateInput} AdminManualRedeemCreateInput */
+type JsonObject = Record<string, any>
 
-/** @param {AdminManualRedeemCreateInput} [payload] */
-/** @param {AdminViewerSessionInput | null} [session] */
 export async function createAdminManualRedeemTask(
-  payload = /** @type {AdminManualRedeemCreateInput} */ ({}),
-  session = null,
-) {
+  payload: AdminManualRedeemCreateInput = {},
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const viewerContext = createAdminViewerContext(session)
   const proofValue = normalizeManualProofValue(payload.proofValue)
   const skuCode = String(payload.skuCode || '').trim()
@@ -285,72 +288,83 @@ export async function createAdminManualRedeemTask(
   return getAdminManualRedeemDetail(createdTask.id, session)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function getAdminManualRedeemDetail(taskId, session = null) {
+export async function getAdminManualRedeemDetail(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   const detail = await getClaimDetailForAdminTask(task.id)
   return decorateManualRedeemDetail(task, detail)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {{ loginType?: string, forceRecreate?: boolean }} [payload] */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function createAdminManualRedeemSession(taskId, payload = {}, session = null) {
+export async function createAdminManualRedeemSession(
+  taskId: AdminEntityIdInput,
+  payload: { loginType?: string, forceRecreate?: boolean } = {},
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   const detail = await createClaimSessionForAdminTask(task.id, payload)
   return decorateManualRedeemDetail(task, detail)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function getAdminManualRedeemSessionSummary(taskId, session = null) {
+export async function getAdminManualRedeemSessionSummary(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   const detail = await getClaimSessionSummaryForAdminTask(task.id)
   return decorateManualRedeemDetail(task, detail)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function reloadAdminManualRedeemSession(taskId, session = null) {
+export async function reloadAdminManualRedeemSession(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   const detail = await reloadClaimSessionForAdminTask(task.id)
   return decorateManualRedeemDetail(task, detail)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function closeAdminManualRedeemSession(taskId, session = null) {
+export async function closeAdminManualRedeemSession(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   const detail = await closeClaimSessionForAdminTask(task.id)
   return decorateManualRedeemDetail(task, detail)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function closeAdminManualRedeemTask(taskId, session = null) {
+export async function closeAdminManualRedeemTask(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   await closeAdminTask(task.id)
   return getAdminManualRedeemDetail(task.id, session)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function confirmAdminManualRedeemRole(taskId, session = null) {
+export async function confirmAdminManualRedeemRole(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   await confirmAdminTaskAssistedRole(task.id, session)
   return getAdminManualRedeemDetail(task.id, session)
 }
 
-/** @param {AdminEntityIdInput} taskId */
-/** @param {AdminViewerSessionInput | null} [session] */
-export async function redeemAdminManualRedeemTask(taskId, session = null) {
+export async function redeemAdminManualRedeemTask(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<JsonObject> {
   const task = await getRequiredManualRedeemTask(taskId, session)
   await redeemAdminTaskAssisted(task.id, session)
   return getAdminManualRedeemDetail(task.id, session)
 }
 
-async function getRequiredManualRedeemTask(taskId, session = null) {
+async function getRequiredManualRedeemTask(
+  taskId: AdminEntityIdInput,
+  session: AdminViewerSessionInput | null = null,
+): Promise<TaskRow> {
   const task = await getTaskById(Number(taskId))
 
   if (!task) {
@@ -392,7 +406,7 @@ async function getRequiredManualRedeemTask(taskId, session = null) {
   return task
 }
 
-function decorateManualRedeemDetail(task, detail) {
+function decorateManualRedeemDetail(task: TaskRow, detail: any): JsonObject {
   const taskContext = parseTaskContext(task)
   const manualRedeem = taskContext.manualRedeem && typeof taskContext.manualRedeem === 'object'
     ? taskContext.manualRedeem
@@ -415,6 +429,6 @@ function decorateManualRedeemDetail(task, detail) {
   }
 }
 
-function normalizeManualProofValue(value) {
+function normalizeManualProofValue(value: unknown): string {
   return String(value || '').replace(/\s+/g, ' ').trim()
 }
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index 4f69ea39..4ed247b0 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -785,6 +785,16 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+201. 后台 Admin 鉴权与人工兑换服务迁移到 `.ts`：
+    - `src/services/admin/admin-auth-service.ts`
+    - `src/services/admin/admin-manual-redeem-service.ts`
+202. 后台默认用户初始化、登录 / session token 验证、用户管理、角色 / 状态归一化、人工兑换任务创建、人工兑换 claim session 包装、确认角色 / 兑换 / 关闭操作已进入 TS 编译链路；admin user row、session、role/status、manual redeem input、entity id、viewer session 与动态详情响应补齐类型
+203. Docker 内验证通过：
+    - `src/services/admin/*.test.js` 共 8 个用例通过
+    - `npm run typecheck`
+    - `npm run build`
+    - `npm test` 共 139 个用例通过
+204. `src/services/admin` 目录下非测试 `.js` 服务文件已全部迁移为 `.ts`
 
 ## 下一步建议