feat(finance): 统一内部 SKU 驱动的履约与财务分流

- 新增 internal_sku_mappings / internal_sku_channels，平台字段统一映射到内部中文 SKU
- 下单入口按内部 SKU 渠道决策修正默认人工路由，自动发货补全 dash sku
- 财务 channel_assign 读取统一渠道表；卡券/人工能力兜底，自动发货/接单要求真实载体
- carrier reconciliation 自动补自动发货任务和接单工单
- pending 落明确原因：无内部 SKU / 无渠道能力 / 无履约载体
- 合并、重判、旧 sku_code 规则清理、部署后 preflight 核对脚本
- 待分类队列按内部 SKU 聚合并展示原因

apps/backend/scripts/reclassify-post-cutover.ts

@@ -33,11 +33,20 @@ async function loadCandidates(limit: number): Promise<Candidate[]> {
       JOIN orders o ON o.id = oi.order_id
       JOIN LATERAL (
         SELECT c.channel
-        FROM product_channel_capabilities c
-        WHERE c.product_id = oi.canonical_product_id
-          AND c.enabled
+        FROM internal_sku_channels c
+        WHERE c.enabled
           AND c.channel IN ('affiliate_dash', 'manual', 'third_party_voucher')
-        ORDER BY c.priority ASC
+          AND btrim(c.internal_sku) = COALESCE(NULLIF(btrim(oi.manual_sku_key), ''), btrim(oi.sku_name))
+        ORDER BY
+          c.priority ASC,
+          CASE c.channel
+            WHEN 'affiliate_dash' THEN 1
+            WHEN 'work_order' THEN 2
+            WHEN 'third_party_voucher' THEN 3
+            WHEN 'manual' THEN 4
+            ELSE 9
+          END,
+          c.channel ASC
         LIMIT 1
       ) cap ON TRUE
       WHERE oi.fulfillment_status = 'assigned'