fix(order-service): 修复包含 Emoji 和孤立代理字符的订单在 PostgreSQL jsonb 下报错导致死循环重试进单的问题

1. 在 utils/json.ts 新增 sanitizeWellFormedUnicode、deepSanitizeUnicode 和 safeJsonStringify，自动清理空字节 (\0) 并将畸变孤立 UTF-16 代理字符 (Lone Surrogates) 安全转换为规范字符，杜绝 PostgreSQL jsonb 解析错误；
2. 拼多多订单映射器与通用进单服务 (order-service) 全面接入 Unicode 深度清洗与安全序列化，确保买家昵称/留言中的各类特殊 Emoji 和生僻字符平滑落库；
3. 数据库仓储层 (order-repo / order-item-repo) 针对 raw_payload_json、spec_json、item_snapshot_json 等 jsonb 字段增加兜底安全序列化保护；
4. 补充 utils/json.test.ts 与 pdd-order-mapper.test.ts 单元测试，覆盖畸变字符与空字节场景。

apps/backend/src/services/platforms/pdd/pdd-order-mapper.test.ts

@@ -100,6 +100,33 @@ test('mapPddOrderToSourceEvent prioritizes out_sku_sn as primary matching field'
   assert.equal((item.spec as Record<string, unknown>).spec, '暗潮1钻')
 })
 
+test('mapPddOrderToSourceEvent sanitizes lone unicode surrogates and null bytes in buyer nickname/memo', () => {
+  const pddOrderWithSurrogates: PddRawOrderItem = {
+    order_sn: '260919-616772441623292',
+    order_status: 2,
+    order_status_str: '已发货',
+    order_amount: 10000,
+    goods_id: 888,
+    goods_name: '测试商品',
+    nickname: '\ud835*VIP\ud83c', // Unpaired lone surrogates
+    buyer_memo: '游戏ID: 12345\0null', // Null byte
+  }
+
+  const event = mapPddOrderToSourceEvent(pddOrderWithSurrogates, {
+    shopId: 'xiangrikui',
+    shopName: '向日葵网络游戏专营店',
+  })
+
+  assert.equal(event.buyerName, '\uFFFD*VIP\uFFFD')
+  assert.equal(event.buyerId, '\uFFFD*VIP\uFFFD')
+  assert.equal(event.receiverContact, '游戏ID: 12345null')
+
+  // JSON stringification should be 100% valid without lone surrogates or null bytes
+  const serialized = JSON.stringify(event.rawPayload)
+  assert.ok(!serialized.includes('\0'))
+  assert.doesNotThrow(() => JSON.parse(serialized))
+})
+
 test('mapPddOrderToSourceEvent reads nested order_goods when top-level goods fields missing', () => {
   const nestedOnly: PddRawOrderItem = {
     order_sn: '260915-111',

apps/backend/src/services/platforms/pdd/pdd-order-mapper.ts

@@ -5,6 +5,7 @@
 
 import type { SourceOrderEvent } from '../../order/order-service.js'
 import type { JsonObject } from '../../../types/json.js'
+import { deepSanitizeUnicode, sanitizeWellFormedUnicode } from '../../../utils/json.js'
 
 export interface PddRawOrderItem {
   order_sn: string
@@ -180,9 +181,13 @@ export function mapPddOrderToSourceEvent(
   const externalSkuCode = skuCode
   const externalSkuName = skuName
 
+  const cleanRawOrder = deepSanitizeUnicode(rawOrder)
+  const cleanNickname = sanitizeWellFormedUnicode(rawOrder.nickname || '')
+  const cleanBuyerMemo = sanitizeWellFormedUnicode(rawOrder.buyer_memo || '').trim()
+
   // Retain the entire raw snapshot dictionary as requested / 保留原始报文完整快照
   const itemSnapshot: JsonObject = {
-    ...(rawOrder as unknown as JsonObject),
+    ...(cleanRawOrder as unknown as JsonObject),
     goodsId: goodsIdStr,
     goodsName,
     spec,
@@ -191,9 +196,9 @@ export function mapPddOrderToSourceEvent(
     quantity,
     orderAmount: Number(rawOrder.order_amount || 0),
     goodsAmount: Number(rawOrder.goods_amount || 0),
-    buyerMemo: String(rawOrder.buyer_memo || ''),
-    mallRemark: String(rawOrder.mall_remark || ''),
-    nickname: String(rawOrder.nickname || ''),
+    buyerMemo: cleanBuyerMemo,
+    mallRemark: sanitizeWellFormedUnicode(rawOrder.mall_remark || ''),
+    nickname: cleanNickname,
     orderTime: rawOrder.order_time,
     confirmTime: rawOrder.confirm_time,
   }
@@ -206,14 +211,14 @@ export function mapPddOrderToSourceEvent(
     platformOrderId: orderSn,
     orderStatus,
     payStatus,
-    buyerId: String(rawOrder.nickname || ''),
-    buyerName: String(rawOrder.nickname || ''),
+    buyerId: cleanNickname,
+    buyerName: cleanNickname,
     // Receiver contact is often buyer's recharge game ID / 买家留言通常为充值游戏账号
-    receiverContact: String(rawOrder.buyer_memo || '').trim(),
+    receiverContact: cleanBuyerMemo,
     totalAmount: Number(rawOrder.order_amount || 0),
     currency: 'CNY',
     paidAt,
-    rawPayload: rawOrder,
+    rawPayload: cleanRawOrder,
     items: [
       {
         itemId: goodsIdStr,