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/admin/write/kuaishou-cloud-helpers.ts

@@ -34,18 +34,7 @@ export type CloudSkuLikeItem = {
   [key: string]: unknown
 }
 
-export type KuaishouCloudFlow = JsonObject & {
-  configId: string
-  internalSkuCode: string
-  internalSkuName: string
-  ticket: JsonObject
-  binding: JsonObject
-  role: JsonObject
-  purchase: JsonObject
-  dispatch: JsonObject
-  returnNumber: JsonObject
-  consume: JsonObject
-}
+export type { KuaishouCloudFlow } from '../../fulfillment/kuaishou-cloud/domain.js'
 
 export type KuaishouCloudBindingResources = {
   skuId: number