继续收紧 TypeScript：ClaimIdentity 契约与 flow 出口类型

- 新增 types/claim-identity，统一 ClaimIdentity / Payload / AdminSummary
- 导出 KuaishouCloudFlow、KuaishouFeifeiFlow 作为 normalize 出口
- 生产路径 JsonObject 统一从 types/json 导入，去掉 rebind as any
- 前后端 claimIdentity 类型字段对齐

apps/backend/src/services/fulfillment/planner.ts

@@ -1,4 +1,5 @@
 import { getFulfillmentProfileByKey } from '../../repositories/fulfillment-profile-repo.js'
+import type { JsonObject } from '../../types/json.js'
 import type { OrderItemRow, OrderRow } from '../../types/repository/rows.js'
 import {
   FULFILLMENT_EXECUTOR_KEYS,
@@ -6,8 +7,6 @@ import {
   isKuaishouFeifeiExecutor,
 } from './executors/types.js'
 
-type JsonObject = Record<string, unknown>
-
 export type FulfillmentBindingLike = {
   id: number
   profile_id?: number