refactor(finance)!: 强制渠道模型，移除旧履约方式与同步链路

- 删除 fulfillment_mode 相关的旧同步/回填链路与定时任务
- 删除 cost_finance_sync、成本快照同步、人工商品归一等遗留服务
- 迁移 113 直接删除 order_items.fulfillment_mode 及其索引约束
- 断代脚本自带归档步骤，不再依赖独立回填脚本
- 退款/事实/总账统一走渠道版销售事实

apps/backend/src/services/worker-platform/sync-worker-orders-service.ts

@@ -45,7 +45,7 @@ import {
 } from './mappers.js'
 import { getWorkerProductMatchConfig } from './worker-product-match-config-service.js'
 import { registerWorkOrderShopName } from './work-order-shop-options-cache.js'
-import { decideOrderItemsFulfillmentModes } from '../fulfillment/fulfillment-mode-service.js'
+import { assignPendingOrderItemChannels } from '../fulfillment/channel-assign-service.js'
 
 export async function syncWorkerOrdersForSourceOrder(
   order: OrderRow,
@@ -308,12 +308,9 @@ export async function syncWorkerOrdersForSourceOrder(
     }
   }
 
-  // 订单处理完成后统一落履约事实；失败不阻断下单，由财务定时任务兜底归集。
+  // 订单处理完成后立即跑一次渠道判定；失败不阻断下单，由定时任务兜底。
   try {
-    await decideOrderItemsFulfillmentModes(
-      orderItems.map((item) => Number(item.id)),
-      { reason: options.source || 'source_order' },
-    )
+    await assignPendingOrderItemChannels({ batchSize: 200, maxBatches: 1 })
   } catch (error) {
     logWarn('[worker-order-consumer]', '履约方式归集失败，等待定时任务兜底', {
       orderId: order.id,