feat(pipeline): 渠道判定后立即归一商品并算成本

- 新增按订单项定向归一，避免新判定订单等冷通道
- 判定/指定渠道后立即归一 → 算成本 → 按业务日回填事实与总账
- 提取 refreshFactsForDates 供管道与渠道服务复用

apps/backend/src/services/fulfillment/channel-assign-service.ts

@@ -3,6 +3,9 @@ import { createHttpError } from '../../utils/http.js'
 import { nowIso } from '../../utils/time.js'
 import { upsertAggregatedException } from '../cost-center/cost-exception-service.js'
 import { readWatermarkItemId } from '../watermark-store.js'
+import { syncCostSnapshotsForItems } from '../cost-center/cost-snapshot-service.js'
+import { normalizeProductsForItems } from '../cost-center/product-normalize-service.js'
+import { orderItemBasisDates, refreshFactsForDates } from '../finance/refresh-facts.js'
 import {
   FULFILLMENT_CHANNELS,
   MATCH_KEY_TYPES,
@@ -145,6 +148,8 @@ export type AssignChannelsResult = {
   byChannel: Record<string, number>
   /** 本轮被判定的订单所属业务日，供事实/总账按日回填。 */
   affectedDates: string[]
+  /** 本轮新判定的订单项（供立即计算成本，最多 2000 条）。 */
+  assignedItemIds: number[]
 }
 
 /** 批量判定：默认只扫 pending 且未锁定的订单项。 */
@@ -169,6 +174,7 @@ export async function assignPendingOrderItemChannels(
     nextCursor: cursor,
     byChannel: {},
     affectedDates: [],
+    assignedItemIds: [],
   }
   const affectedDates = new Set<string>()
 
@@ -262,6 +268,7 @@ export async function assignPendingOrderItemChannels(
         ],
       )
       result.assigned += updated.rowCount || 0
+      result.assignedItemIds = assignments.map((row) => row.id).slice(0, 2000)
     }
   }
 
@@ -305,7 +312,17 @@ export async function assignChannelToOrderItems(input: {
     [ids, input.channel, input.adminUserId, String(input.note || '').slice(0, 200)],
   )
 
-  return { updated: result.rowCount || 0 }
+  const updated = result.rowCount || 0
+  if (updated > 0) {
+    // 运营指定后先归一商品，再立即算成本并回填事实，避免旧单等冷通道。
+    await normalizeProductsForItems(ids).catch(() => undefined)
+    const cost = await syncCostSnapshotsForItems(ids).catch(() => null)
+    const dates = [
+      ...new Set([...(await orderItemBasisDates(ids)), ...(cost?.affectedDates || [])]),
+    ]
+    await refreshFactsForDates(dates).catch(() => undefined)
+  }
+  return { updated }
 }
 
 /** 运营解锁：允许自动判定重新接管。 */