feat(pdd): 原生内嵌拼多多多店铺订单同步子服务与anti-content纯算引擎

1. 纯算引擎 (pdd-anti-content.ts):
   - 100% 纯 TypeScript 原生还原 0as anti-content 算法，零 npm 依赖（仅基于 Node.js 原生 zlib 与 crypto）。
   - 包含 22 个环境特征 Tag TLV 组包、zlib 标准压缩、4 字节尾部扰动盐与 64 字符动态位移 Base64 编码，单次耗时 < 0.1ms。

2. MMS 接口客户端与数据映射 (pdd-client.ts, pdd-order-mapper.ts):
   - 基于原生 fetch 实现高可用 MMS 请求，支持拼多多网关毫秒级服务器时间校准 (/api/server/_stm)。
   - 实现拼多多订单状态与字段规范映射为平台 SourceOrderEvent，精准保留买家留言与充值账号信息。

3. 多店铺配置与防风控错峰调度 (pdd-source-config-service.ts, pdd-sync-service.ts):
   - 支持多店铺账号配置持久化（PostgreSQL app_config_entries 与本地 JSON 双模兜底）。
   - 实现店铺间轻量错峰拉取机制，避免并发峰值触发平台 40002 频控。

4. 内存级自动进单与派单流转:
   - 拉取新订单后在 Node.js 内存中直接调用 upsertOrderFromSource()，自动完成 orders/order_items 入库、商品规则匹配与打手大厅工单 (work_orders) 实时广播。

5. 调度器与管理端 API (scheduler-service.ts, platform-config/pdd.ts):
   - 注册 pdd_order_sync 定时任务（默认 20s 轮询），提供管理端店铺配置查看、保存、删除及手动立即同步接口。
   - 所有新增代码均遵循中英双语注释规范，并通过类型检查与单元测试。

apps/backend/src/routes/admin/platform-config.ts

@@ -8,6 +8,7 @@ import ninetyoneRouter from './platform-config/ninetyone.js'
 import notificationsRouter from './platform-config/notifications.js'
 import fulfillmentRoutingRouter from './platform-config/fulfillment-routing.js'
 import affiliateDashRouter from './platform-config/affiliate-dash.js'
+import pddRouter from './platform-config/pdd.js'
 
 const router = Router()
 
@@ -19,5 +20,6 @@ router.use('/platform-config', ninetyoneRouter)
 router.use('/platform-config', fulfillmentRoutingRouter)
 router.use('/platform-config', cloudtentaclesRouter)
 router.use('/platform-config', affiliateDashRouter)
+router.use('/platform-config', pddRouter)
 
 export default router

apps/backend/src/routes/admin/platform-config/pdd.ts

@@ -0,0 +1,140 @@
+/**
+ * Pinduoduo Admin Platform Config Routes
+ * 拼多多平台管理端配置与手动同步路由
+ */
+
+import { Router } from 'express'
+import { createJsonHandler } from '../session.js'
+import type { JsonRecord, JsonObject } from '../../../types/json.js'
+import {
+  getPddSourcesConfig,
+  savePddSourcesConfig,
+  savePddStore,
+  deletePddStore,
+  getPddStoreById,
+} from '../../../services/platforms/pdd/pdd-source-config-service.js'
+import {
+  syncAllPddStores,
+  syncStoreOrders,
+} from '../../../services/platforms/pdd/pdd-sync-service.js'
+import { createHttpError } from '../../../utils/http.js'
+
+const router = Router()
+
+/**
+ * GET /platform-config/pdd
+ * Get complete PDD configuration and store list.
+ * 读取拼多多全局配置及所有店铺列表。
+ */
+router.get(
+  '/pdd',
+  createJsonHandler(() => getPddSourcesConfig(), {
+    successMessage: 'ok',
+    errorMessage: '读取拼多多配置失败',
+    scope: '[admin/platform-config/pdd]',
+  }),
+)
+
+/**
+ * POST /platform-config/pdd
+ * Save full PDD configuration.
+ * 保存拼多多全局配置。
+ */
+router.post(
+  '/pdd',
+  createJsonHandler((req) => savePddSourcesConfig(req.body), {
+    successMessage: '拼多多配置已保存',
+    errorMessage: '保存拼多多配置失败',
+    scope: '[admin/platform-config/pdd]',
+    audit: (_req, data) => {
+      const result = data as JsonRecord
+      return {
+        action: 'platform_pdd_config_updated',
+        targetType: 'platform_config',
+        targetId: 'pdd',
+        data: {
+          enabled: result?.enabled !== false,
+          storeCount: Array.isArray(result?.stores) ? result.stores.length : 0,
+        },
+      }
+    },
+  }),
+)
+
+/**
+ * POST /platform-config/pdd/stores/:shopId
+ * Add or update a single PDD store configuration.
+ * 新增或更新单个拼多多店铺配置。
+ */
+router.post(
+  '/pdd/stores/:shopId',
+  createJsonHandler((req) => savePddStore(req.params.shopId, (req.body || {}) as JsonObject), {
+    successMessage: '拼多多店铺配置已更新',
+    errorMessage: '更新拼多多店铺配置失败',
+    scope: '[admin/platform-config/pdd/stores/:shopId]',
+    audit: (req) => ({
+      action: 'platform_pdd_store_updated',
+      targetType: 'platform_store',
+      targetId: String(req.params.shopId || ''),
+    }),
+  }),
+)
+
+/**
+ * DELETE /platform-config/pdd/stores/:shopId
+ * Delete a PDD store.
+ * 删除指定拼多多店铺。
+ */
+router.delete(
+  '/pdd/stores/:shopId',
+  createJsonHandler((req) => deletePddStore(req.params.shopId), {
+    successMessage: '拼多多店铺已删除',
+    errorMessage: '删除拼多多店铺失败',
+    scope: '[admin/platform-config/pdd/stores/:shopId]',
+    audit: (req) => ({
+      action: 'platform_pdd_store_deleted',
+      targetType: 'platform_store',
+      targetId: String(req.params.shopId || ''),
+    }),
+  }),
+)
+
+/**
+ * POST /platform-config/pdd/sync
+ * Manually trigger order sync for all stores or a specific store.
+ * 手动触发拼多多订单同步（支持指定 shopId 或全店铺）。
+ */
+router.post(
+  '/pdd/sync',
+  createJsonHandler(
+    async (req) => {
+      const body = (req.body || {}) as { shopId?: string; pageSize?: number }
+      const shopId = String(body.shopId || '').trim()
+
+      if (shopId) {
+        const store = getPddStoreById(shopId)
+        if (!store) {
+          throw createHttpError(`店铺不存在: ${shopId}`, {
+            statusCode: 404,
+            errorCode: 'pdd_store_not_found',
+          })
+        }
+        return syncStoreOrders(store, { pageSize: body.pageSize || 10 })
+      }
+
+      return syncAllPddStores({ pageSize: body.pageSize || 10 })
+    },
+    {
+      successMessage: '拼多多同步已触发',
+      errorMessage: '触发拼多多同步失败',
+      scope: '[admin/platform-config/pdd/sync]',
+      audit: (req) => ({
+        action: 'platform_pdd_manual_sync_triggered',
+        targetType: 'platform_sync',
+        targetId: String((req.body as { shopId?: string })?.shopId || 'all'),
+      }),
+    },
+  ),
+)
+
+export default router