fix: portal端token过期后自动跳转登录页，避免显示空数据

- portalAxios 401 响应拦截器：清除 token 并跳转 /portal/login
- PortalLayoutWrapper：检查 token 是否存在，不存在则跳转登录页
- 排除 /portal/login 和 /portal/auto-login 页面避免重复跳转

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

frontend/src/App.tsx

@@ -19,6 +19,7 @@ const ForgotPassword = lazyRetry(() => import('./pages/auth/ForgotPassword'))
 const Dashboard = lazyRetry(() => import('./pages/Dashboard'))
 const Money = lazyRetry(() => import('./pages/Money'))
 const SocialInsurance = lazyRetry(() => import('./pages/SocialInsurance'))
+const Overtime = lazyRetry(() => import('./pages/Overtime'))
 const Roster = lazyRetry(() => import('./pages/Roster'))
 const OrgChart = lazyRetry(() => import('./pages/OrgChart'))
 const SupportDashboard = lazyRetry(() => import('./pages/support/SupportDashboard'))
@@ -141,6 +142,12 @@ function PlatformLayout({ children }: { children: React.ReactNode }) {
 }
 
 function PortalLayoutWrapper({ children, showNav = true }: { children: React.ReactNode; showNav?: boolean }) {
+  // 检查 portal token 是否存在，不存在则跳转登录页
+  const portalToken = localStorage.getItem('portalToken')
+  if (!portalToken) {
+    window.location.href = '/portal/login'
+    return null
+  }
   if (!showNav) {
     return (
       <div className="min-h-screen bg-surface pt-safe pb-safe">
@@ -192,6 +199,7 @@ export default function App() {
       <Route path="/support" element={<ProtectedRoute><AdminLayout><SupportDashboard /></AdminLayout></ProtectedRoute>} />
       <Route path="/money" element={<ProtectedRoute><AdminLayout><Money /></AdminLayout></ProtectedRoute>} />
       <Route path="/social" element={<ProtectedRoute><AdminLayout><SocialInsurance /></AdminLayout></ProtectedRoute>} />
+      <Route path="/overtime" element={<ProtectedRoute><AdminLayout><Overtime /></AdminLayout></ProtectedRoute>} />
       <Route path="/termination" element={<ProtectedRoute><AdminLayout><Termination /></AdminLayout></ProtectedRoute>} />
       <Route path="/ai-assistant" element={<ProtectedRoute><AdminLayout><AIAssistant /></AdminLayout></ProtectedRoute>} />
       <Route path="/settings" element={<ProtectedRoute><AdminLayout><Settings /></AdminLayout></ProtectedRoute>} />