fix(auth): return 401 when valid token but user not found

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

server/api/auth/me.get.ts

@@ -29,8 +29,8 @@ export default defineEventHandler(async (event) => {
     .limit(1);
 
   if (!user) {
-    setResponseStatus(event, 404);
-    return { error: { code: "NOT_FOUND", message: "用户不存在" } };
+    setResponseStatus(event, 401);
+    return { error: { code: "TOKEN_EXPIRED", message: "用户状态异常" } };
   }
 
   return { user };