feat(auth): 添加401未授权处理，清除token并重定向到登录页面

frontend/portal/src/utils/request.js

@@ -36,6 +36,16 @@ export async function request(endpoint, options = {}) {
         }
 
         if (!res.ok) {
+            // Handle 401 Unauthorized
+            if (res.status === 401) {
+                localStorage.removeItem('token');
+                localStorage.removeItem('user');
+                // Redirect to login if not already there
+                if (!window.location.pathname.startsWith('/auth/login')) {
+                    window.location.href = '/auth/login';
+                }
+            }
+
             // Handle errorx response { code, message, error_id }
             const errorMsg = data.message || `Request failed with status ${res.status}`;
             throw new Error(errorMsg);