fix(finance): 重写履约路由迁移与统一渠道配置

重写 120/121 迁移，统一内部 SKU、渠道 id、config_json 和旧规则转换。

后台渠道配置改读统一渠道表，卡券与人工配置不再写旧规则。

增加安全渠道切换，并排除已关闭、失败或过期的历史任务载体。

按生产 119 基线重跑迁移、完整履约财务链路和严格预检。

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

@@ -55,6 +55,7 @@ export async function syncWorkerOrdersForSourceOrder(
     autoOnly?: boolean
     sourceMetadata?: JsonObject
     skipChannelAssign?: boolean
+    preferredWorkRuleKey?: string
   } = {},
 ) {
   const [rules, mappings] = await Promise.all([
@@ -80,9 +81,36 @@ export async function syncWorkerOrdersForSourceOrder(
       continue
     }
 
-    const match = resolveMatchingProductRuleDecision(order, item, rules, mappings, {
-      legacyFallbackEnabled: productMatchConfig.legacyFallbackEnabled,
-    })
+    const preferredRuleKey = String(options.preferredWorkRuleKey || '').trim()
+    const preferredRule = preferredRuleKey
+      ? rules.find((rule) => String(rule.rule_key || '').trim() === preferredRuleKey) || null
+      : null
+    const match =
+      preferredRuleKey && !preferredRule
+        ? {
+            rule: null,
+            mappingId: null,
+            reason: 'unmatched' as const,
+            score: 0,
+            candidates: [],
+            diagnosis: [
+              {
+                dimension: 'internal_sku_channel',
+                reason: 'configured_work_rule_missing',
+              },
+            ],
+          }
+        : preferredRule
+          ? {
+              rule: preferredRule,
+              mappingId: null,
+              reason: 'matched' as const,
+              score: 1,
+              candidates: [{ ruleKey: preferredRuleKey, score: 1, mappingId: null }],
+            }
+          : resolveMatchingProductRuleDecision(order, item, rules, mappings, {
+              legacyFallbackEnabled: productMatchConfig.legacyFallbackEnabled,
+            })
     const matchContext = resolveKuaishouWorkProductMatchContext(item)
     const snapshot = safeParseJson(item.item_snapshot_json)
     const sellerId =