fix(handler): 统一错误处理并替换Next.js重写为路由处理器

- 将所有handler中的Fail函数调用替换为FailError以统一错误处理
- 添加FailError函数实现统一的错误日志记录和响应格式
- 移除Next.js配置中的rewrites并实现统一的API路由代理处理器
- 新增路由处理器支持长连接和大文件上传场景的代理转发
- 更新错误处理逻辑避免将内部错误详情暴露给前端用户

web/src/app/api/[...path]/route.ts

@@ -0,0 +1,57 @@
+import type { NextRequest } from "next/server";
+
+export const runtime = "nodejs";
+export const maxDuration = 300;
+
+type RouteContext = {
+  params: Promise<{ path: string[] }>;
+};
+
+function proxyHeaders(request: NextRequest) {
+  const headers = new Headers(request.headers);
+  headers.delete("host");
+  headers.delete("content-length");
+  headers.delete("connection");
+  return headers;
+}
+
+function responseHeaders(response: Response) {
+  const headers = new Headers(response.headers);
+  headers.delete("content-length");
+  headers.delete("content-encoding");
+  headers.delete("transfer-encoding");
+  return headers;
+}
+
+async function proxy(request: NextRequest, context: RouteContext) {
+  const { path } = await context.params;
+  const apiBaseUrl = process.env.API_BASE_URL || "http://127.0.0.1:8080";
+  const target = `${apiBaseUrl.replace(/\/$/, "")}/api/${path.map(encodeURIComponent).join("/")}${request.nextUrl.search}`;
+  const hasBody = request.method !== "GET" && request.method !== "HEAD";
+
+  try {
+    const response = await fetch(target, {
+      method: request.method,
+      headers: proxyHeaders(request),
+      body: hasBody ? request.body : undefined,
+      duplex: hasBody ? "half" : undefined,
+    } as RequestInit & { duplex?: "half" });
+
+    return new Response(response.body, {
+      status: response.status,
+      statusText: response.statusText,
+      headers: responseHeaders(response),
+    });
+  } catch (error) {
+    console.error("Failed to proxy", target, error);
+    return Response.json({ code: 1, data: null, msg: "接口连接失败，请确认后端服务已启动" }, { status: 502 });
+  }
+}
+
+export const GET = proxy;
+export const HEAD = proxy;
+export const POST = proxy;
+export const PUT = proxy;
+export const PATCH = proxy;
+export const DELETE = proxy;
+export const OPTIONS = proxy;