feat: 接口统一优化

app/services/answer_service.ts

@@ -1,5 +1,6 @@
 // app/services/answer_service.ts - OCS AI 答题服务相关 API
 import type {
+  IApiResponse,
   IClearCacheResponse,
   IHealthResponse,
   IRecordsRequest,
@@ -27,14 +28,14 @@ export class AnswerService {
 
   /** 读取健康状态；无需 token */
   public static getHealth() {
-    return BaseClientService.get<IHealthResponse>(
+    return BaseClientService.get<IApiResponse<IHealthResponse>>(
       `${AnswerService.basePath}/health`
     );
   }
 
   /** 读取运行统计（需登录） */
   public static getStats() {
-    return BaseClientService.get<IStatsResponse>(
+    return BaseClientService.get<IApiResponse<IStatsResponse>>(
       `${AnswerService.basePath}/stats`
     );
   }