diff --git a/packages/core/src/proxy.ts b/packages/core/src/proxy.ts
index 9e5054e..4edc9a9 100644
--- a/packages/core/src/proxy.ts
+++ b/packages/core/src/proxy.ts
@@ -1,11 +1,27 @@
 import createIntlMiddleware from 'next-intl/middleware';
 import { routing } from './i18n/routing';
-import type { NextRequest } from 'next/server';
-import { NextResponse } from 'next/server';
+import { NextRequest, NextResponse } from 'next/server';
 
 const intlMiddleware = createIntlMiddleware(routing);
 
+/**
+ * # proxy
+ * 说明：站点入口中间件。
+ *  - 显式规范化：/en 与 /en/* 307 → 去前缀形式（/ 与 /*）。
+ *    底座契约：默认语言 URL 不带前缀；历史/外部 /en/* 链接永远落到规范 URL，
+ *    行为不依赖 next-intl 内部实现。中文 /zh/* 由 intlMiddleware 正常处理。
+ */
 export function proxy(request: NextRequest) {
+  const { pathname, search } = request.nextUrl;
+
+  if (pathname === '/en' || pathname.startsWith('/en/')) {
+    const target = pathname === '/en' ? '/' : pathname.slice(3);
+    return NextResponse.redirect(
+      new URL(`${target}${search}`, request.url),
+      307
+    );
+  }
+
   return intlMiddleware(request);
 }