diff --git a/apps/backend/src/services/admin/platform-config/fulfillment.js b/apps/backend/src/services/admin/platform-config/fulfillment.ts
similarity index 89%
rename from apps/backend/src/services/admin/platform-config/fulfillment.js
rename to apps/backend/src/services/admin/platform-config/fulfillment.ts
index 28f905b2..76806ae7 100644
--- a/apps/backend/src/services/admin/platform-config/fulfillment.js
+++ b/apps/backend/src/services/admin/platform-config/fulfillment.ts
@@ -1,11 +1,11 @@
-// @ts-check
-
 import { createHttpError } from '../../../utils/http.js'
 import { formatFenToAmount } from '../../../utils/money.js'
 import { isPlainObject, pickFirstNonEmpty } from './context.js'
 import { mapAdminObservedProductItem } from './domain.js'
 
-export function normalizeFulfillmentLookupPayload(payload = {}) {
+type JsonObject = Record<string, any>
+
+export function normalizeFulfillmentLookupPayload(payload: JsonObject = {}) {
   const provider = String(payload.provider || 'agiso').trim() || 'agiso'
   const platform = String(payload.platform || 'xianyu').trim() || 'xianyu'
   const shopId = String(payload.shopId || '').trim()
@@ -35,7 +35,7 @@ export function normalizeFulfillmentLookupPayload(payload = {}) {
   return { provider, platform, shopId, platformOrderId }
 }
 
-export function resolveFulfillmentLookupDetail(detailResult, platformOrderId) {
+export function resolveFulfillmentLookupDetail(detailResult: JsonObject, platformOrderId: unknown) {
   const detail = isPlainObject(detailResult?.parsed) ? detailResult.parsed : {}
   const items = Array.isArray(detail.items) ? detail.items : []
 
@@ -66,10 +66,19 @@ export function buildFulfillmentLookupResult({
   platform = '',
   shopId = '',
   platformOrderId = '',
-  detail = /** @type {Record<string, unknown>} */ ({}),
-  detailResult = /** @type {Record<string, unknown>} */ ({}),
+  detail = {},
+  detailResult = {},
   bindings = [],
   fallbackShopName = '',
+}: {
+  provider?: string
+  platform?: string
+  shopId?: string
+  platformOrderId?: string
+  detail?: JsonObject
+  detailResult?: JsonObject
+  bindings?: JsonObject[]
+  fallbackShopName?: string
 } = {}) {
   const resolvedShopName = pickFirstNonEmpty([detail.shopName, fallbackShopName])
   const items = Array.isArray(detail.items) ? detail.items : []
diff --git a/apps/backend/src/services/admin/platform-config/observed-products.js b/apps/backend/src/services/admin/platform-config/observed-products.ts
similarity index 85%
rename from apps/backend/src/services/admin/platform-config/observed-products.js
rename to apps/backend/src/services/admin/platform-config/observed-products.ts
index 0c66b338..295dcdc2 100644
--- a/apps/backend/src/services/admin/platform-config/observed-products.js
+++ b/apps/backend/src/services/admin/platform-config/observed-products.ts
@@ -1,8 +1,8 @@
-// @ts-check
-
 import { query } from '../../../db/client.js'
 import { mapAdminObservedProductItem } from './domain.js'
 
+type JsonObject = Record<string, any>
+
 export const ADMIN_OBSERVED_PRODUCTS_QUERY = `
   SELECT
     o.provider,
@@ -31,7 +31,7 @@ export const ADMIN_OBSERVED_PRODUCTS_QUERY = `
   LIMIT 200
 `
 
-export function mapAdminObservedProductRow(row = {}) {
+export function mapAdminObservedProductRow(row: JsonObject = {}) {
   return {
     provider: String(row.provider || '').trim(),
     platform: String(row.platform || '').trim(),
@@ -45,10 +45,8 @@ export function mapAdminObservedProductRow(row = {}) {
   }
 }
 
-export async function listAdminObservedProducts(bindings = [], options = {}) {
-  const queryImpl = /** @type {(sql: string) => Promise<{ rows: Array<Record<string, unknown>> }>} */ (
-    options.query || query
-  )
+export async function listAdminObservedProducts(bindings: JsonObject[] = [], options: JsonObject = {}) {
+  const queryImpl = (options.query || query) as (sql: string) => Promise<{ rows: JsonObject[] }>
   const rowsResult = await queryImpl(ADMIN_OBSERVED_PRODUCTS_QUERY)
   return rowsResult.rows.map((row) => mapAdminObservedProductItem(mapAdminObservedProductRow(row), bindings))
 }
diff --git a/apps/backend/src/services/admin/platform-config/writes.js b/apps/backend/src/services/admin/platform-config/writes.ts
similarity index 83%
rename from apps/backend/src/services/admin/platform-config/writes.js
rename to apps/backend/src/services/admin/platform-config/writes.ts
index bb8782c3..8886455d 100644
--- a/apps/backend/src/services/admin/platform-config/writes.js
+++ b/apps/backend/src/services/admin/platform-config/writes.ts
@@ -1,14 +1,14 @@
-// @ts-check
-
 import { applyOptionalStringField } from "./domain.js";
 
-export function buildAdminAgisoShopConfigUpdate(item, current = {}) {
+type JsonObject = Record<string, any>
+
+export function buildAdminAgisoShopConfigUpdate(item: JsonObject, current: JsonObject = {}) {
   const shopId = String(item?.shopId || "").trim();
   if (!shopId) {
     return null;
   }
 
-  const next = /** @type {Record<string, unknown>} */ ({ ...current });
+  const next: JsonObject = { ...current };
   const shopName = String(item?.shopName || "").trim();
   const accessToken = String(item?.accessToken || "").trim();
   const messageTemplate = String(item?.messageTemplate || "").trim();
@@ -58,20 +58,16 @@ export function buildAdminAgisoShopConfigUpdate(item, current = {}) {
 }
 
 export function buildAdminAgisoMessagingSavePayload(
-  payload = {},
-  options = {}
+  payload: JsonObject = {},
+  options: JsonObject = {}
 ) {
   const rawItems = Array.isArray(payload.shops) ? payload.shops : [];
-  const currentDefaults = /** @type {Record<string, unknown>} */ (
-    options.currentDefaults || {}
-  );
-  const currentMap = /** @type {Record<string, Record<string, unknown>>} */ (
-    options.currentMap || {}
-  );
-  const nextDefaults = /** @type {Record<string, unknown>} */ ({
+  const currentDefaults: JsonObject = options.currentDefaults || {};
+  const currentMap: Record<string, JsonObject> = options.currentMap || {};
+  const nextDefaults: JsonObject = {
     ...currentDefaults,
-  });
-  const nextMap = /** @type {Record<string, Record<string, unknown>>} */ ({});
+  };
+  const nextMap: Record<string, JsonObject> = {};
 
   applyOptionalStringField(nextDefaults, "messageTemplate", payload.defaults);
   applyOptionalStringField(
@@ -103,7 +99,7 @@ export function buildAdminAgisoMessagingSavePayload(
   };
 }
 
-export function normalizeAdminCloudtentaclesSourceConfigPayload(payload = {}) {
+export function normalizeAdminCloudtentaclesSourceConfigPayload(payload: JsonObject = {}) {
   const sourceKey =
     String(payload.sourceKey || payload.key || "").trim() || "default";
   return {
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index 49ebaebb..3106e569 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -589,6 +589,16 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+138. 后台平台配置观察 / 查询 / 写入辅助模块迁移到 `.ts`：
+    - `src/services/admin/platform-config/observed-products.ts`
+    - `src/services/admin/platform-config/fulfillment.ts`
+    - `src/services/admin/platform-config/writes.ts`
+139. 后台观察商品列表、履约手动查询结果组装、Agiso 店铺消息配置写入与 Cloudtentacles 来源配置归一化已进入 TS 编译链路；查询依赖、payload 与配置 map 补齐动态对象类型
+140. Docker 内验证通过：
+    - `src/services/admin/platform-config/observed-products.test.js`、`fulfillment.test.js`、`writes.test.js` 共 8 个用例通过
+    - `npm run typecheck`
+    - `npm run build`
+    - `npm test` 共 139 个用例通过
 
 ## 下一步建议