feat: 接口统一优化

server/api/health.get.ts

@@ -1,5 +1,6 @@
 // server/api/health.get.ts - 服务健康检查接口
 import { serverEnv } from "~~/server/utils/env";
+import { apiOk } from "~~/server/utils/response";
 import { SERVICE_VERSION } from "~~/server/utils/runtimeState";
 
 /**
@@ -9,10 +10,10 @@ import { SERVICE_VERSION } from "~~/server/utils/runtimeState";
  * 返回模型名，但不返回 API Key、baseURL 或其他敏感配置
  */
 export default defineEventHandler(() => {
-  return {
-    status: "ok",
+  return apiOk({
+    status: "ok" as const,
     message: "AI题库服务运行正常",
     version: SERVICE_VERSION,
     model: serverEnv.openAiModel
-  };
+  });
 });