fix(finance): 待分类队列按内部中文 SKU 去重与分流

- 同一内部 SKU 的不同平台 SKU 合并为一行（显示平台 SKU 列表）
- 指定渠道按 internal_sku 批量更新，并生成 internal_sku 规则
- 渠道候选的 internal_sku 优先取中文 manual_sku_key/sku_name

apps/backend/src/routes/admin/fulfillment-channel.ts

@@ -8,6 +8,7 @@
 import { Router } from 'express'
 
 import {
+  assignChannelByInternalSku,
   assignChannelBySku,
   assignChannelToOrderItems,
   deleteChannelRule,
@@ -79,6 +80,18 @@ router.post(
       const adminUserId = req.adminSession?.userId ?? null
       const note = String(body.note || '')
 
+      if (body.internalSku) {
+        return assignChannelByInternalSku({
+          provider: String(body.provider || ''),
+          shopId: String(body.shopId || ''),
+          internalSku: String(body.internalSku),
+          channel,
+          adminUserId,
+          note,
+          createRule: body.createRule !== false,
+        })
+      }
+
       if (body.skuCode) {
         return assignChannelBySku({
           provider: String(body.provider || ''),