feat: admin panel and invite acceptance UI

src/App.tsx

@@ -9,6 +9,8 @@ import ClientDetailPage from '@/pages/ClientDetailPage';
 import EventsPage from '@/pages/EventsPage';
 import EmailsPage from '@/pages/EmailsPage';
 import SettingsPage from '@/pages/SettingsPage';
+import AdminPage from '@/pages/AdminPage';
+import InvitePage from '@/pages/InvitePage';
 import { PageLoader } from '@/components/LoadingSpinner';
 
 function ProtectedRoute({ children }: { children: React.ReactNode }) {
@@ -31,6 +33,7 @@ export default function App() {
         <Route path="/login" element={
           isAuthenticated ? <Navigate to="/" replace /> : <LoginPage />
         } />
+        <Route path="/invite/:token" element={<InvitePage />} />
         <Route path="/" element={
           <ProtectedRoute>
             <Layout />
@@ -42,6 +45,7 @@ export default function App() {
           <Route path="events" element={<EventsPage />} />
           <Route path="emails" element={<EmailsPage />} />
           <Route path="settings" element={<SettingsPage />} />
+          <Route path="admin" element={<AdminPage />} />
         </Route>
       </Routes>
     </BrowserRouter>