fix(data): 清理旧数据并保护服务端写入

apps/web/lib/api.ts

@@ -3,6 +3,25 @@ const API_BASE = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3001/api/v
 let apiAvailable: boolean | null = null;
 let probePromise: Promise<boolean> | null = null;
 
+function getErrorMessage(body: unknown, status: number) {
+  if (typeof body === 'object' && body !== null && 'message' in body) {
+    const message = (body as { message?: unknown }).message;
+    if (typeof message === 'string') return message;
+    if (Array.isArray(message)) return message.join(', ');
+  }
+  return `Request failed: ${status}`;
+}
+
+export class ApiRequestError extends Error {
+  constructor(
+    public readonly status: number,
+    public readonly body: unknown,
+  ) {
+    super(getErrorMessage(body, status));
+    this.name = 'ApiRequestError';
+  }
+}
+
 async function checkApi(): Promise<boolean> {
   if (apiAvailable !== null) return apiAvailable;
   if (probePromise) return probePromise;
@@ -29,7 +48,7 @@ async function request<T>(path: string, options?: RequestInit): Promise<T> {
   if (!res) throw new Error('API 不可用');
   if (!res.ok) {
     const error = await res.json().catch(() => ({}));
-    throw new Error(error.message || `请求失败: ${res.status}`);
+    throw new ApiRequestError(res.status, error);
   }
   return res.json();
 }
@@ -56,7 +75,7 @@ export const api = {
       });
       if (!res.ok) {
         const err = await res.json().catch(() => ({}));
-        throw new Error(err.message || `请求失败: ${res.status}`);
+        throw new ApiRequestError(res.status, err);
       }
       return res.json();
     } finally {