重构中间件逻辑，将代理功能移至 middleware.ts，删除 proxy.ts 文件

Author: hotlong

packages/site/app/page.tsx

@@ -9,7 +9,7 @@
 import { redirect } from 'next/navigation';
 
 /**
- * Root page - redirects are handled by proxy.ts middleware
+ * Root page - redirects are handled by middleware.ts
  * This page should never actually render as the middleware intercepts and redirects
  * But Next.js requires a page component for the route to be recognized
  */

packages/site/proxy.ts packages/site/middleware.tspackages/site/proxy.ts renamed to packages/site/middleware.ts

@@ -13,7 +13,7 @@ import { NextResponse, NextRequest, NextFetchEvent } from 'next/server';
 // Create fumadocs middleware
 const fumadocsMiddleware = createI18nMiddleware(i18n);
 
-export default function proxy(request: NextRequest, event: NextFetchEvent) {
+export default function middleware(request: NextRequest, event: NextFetchEvent) {
   const path = request.nextUrl.pathname;
 
   // Handle root path separately with custom language detection