Revert "feat: use middleware to auth"

This reverts commit f57cdb5ec1.

src/middleware.ts

@@ -1,56 +0,0 @@
-import { NextRequest, NextResponse } from 'next/server';
-
-// 全站（含 /api）鉴权中间件，运行于 Edge Runtime。
-export async function middleware(req: NextRequest) {
-  const { pathname, search } = req.nextUrl;
-
-  // 1. 放行无需鉴权的路径
-  if (
-    pathname.startsWith('/login') || // 登录页
-    pathname.startsWith('/api/login') || // 登录接口
-    pathname.startsWith('/_next') || // Next.js 静态文件
-    pathname === '/favicon.ico' ||
-    pathname.startsWith('/icons') ||
-    pathname === '/manifest.json' ||
-    pathname === '/logo.png' ||
-    pathname === '/screenshot.png'
-  ) {
-    return NextResponse.next();
-  }
-
-  // 内部请求标记，避免递归拦截
-  if (req.headers.get('x-internal-auth') === 'true') {
-    return NextResponse.next();
-  }
-
-  // 通过后端接口验证登录状态（GET /api/login）
-  const origin = req.nextUrl.origin;
-  const verifyRes = await fetch(`${origin}/api/login`, {
-    method: 'GET',
-    headers: {
-      Cookie: req.headers.get('cookie') || '',
-      'x-internal-auth': 'true',
-    },
-  });
-
-  if (verifyRes.ok) {
-    return NextResponse.next();
-  }
-
-  // 未通过校验：API 返回 401，页面跳转登录
-  if (pathname.startsWith('/api')) {
-    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
-  }
-
-  const loginUrl = req.nextUrl.clone();
-  loginUrl.pathname = '/login';
-  loginUrl.searchParams.set('redirect', pathname + search);
-  return NextResponse.redirect(loginUrl);
-}
-
-// 2. 指定哪些路径使用 middleware
-export const config = {
-  matcher: [
-    '/((?!_next/static|_next/image|favicon.ico|manifest.json|icons|logo.png|screenshot.png|api/login).*)',
-  ],
-};