重构：前端架构优化 - 消灭巨石文件，统一代码规范

Phase 1 - 消灭巨石页面：
- 拆分 AdminKuaishouCloudFulfillmentView (1,224行→kuaishou-cloud/子目录)
- 拆分 AdminFulfillmentBindingsView (989行→bindings/子目录)
- 拆分 AdminTaskDetailView (1,007行→9个子组件+2个composable)
- 合并去重 useClaimPage + useAdminManualRedeemPage (1,554行→共享模块+差异化薄层)
- 拆分 services/admin/platform-config.ts (477行→8个领域子模块)

Phase 2 - 架构收口：
- 拆分 types/admin.ts (925行→13个子文件+platform-config/子目录)
- 统一 API code 检查（http.ts拦截器统一处理业务错误）
- 修改 apiPost 签名消除 as unknown as 类型断言（6处）
- 新增 BusinessError 类型便于错误分类处理

所有改动通过 vue-tsc --noEmit 零错误和 vite build 验证

apps/frontend/src/lib/http.ts

@@ -17,7 +17,22 @@ const http = axios.create({
 })
 
 http.interceptors.response.use(
-  (response) => response.data,
+  (response) => {
+    const data = response.data as ApiEnvelope<unknown>
+
+    // Business-level error: HTTP 200 but code !== 0
+    if (typeof data?.code === 'number' && data.code !== 0) {
+      const error = new Error(data.msg || '操作失败') as Error & {
+        errorCode?: string
+        code?: number
+      }
+      error.errorCode = data.errorCode
+      error.code = data.code
+      return Promise.reject(error)
+    }
+
+    return response.data
+  },
   (error) => {
     const responseMessage =
       typeof error?.response?.data?.msg === 'string' ? error.response.data.msg.trim() : ''
@@ -111,8 +126,8 @@ export function apiGetBlob(url: string, params?: Record<string, unknown>) {
   })
 }
 
-export function apiPost<T>(url: string, data?: Record<string, unknown>) {
-  return request<T>({ method: 'POST', url, data })
+export function apiPost<T>(url: string, data?: unknown) {
+  return request<T>({ method: 'POST', url, data: data as Record<string, unknown> })
 }
 
 export function apiDelete<T>(url: string) {