adding chat features, admin features and bug fixes

frontend/src/App.tsx

@@ -24,6 +24,8 @@ import Kalender from './pages/Kalender';
 import UebungDetail from './pages/UebungDetail';
 import Veranstaltungen from './pages/Veranstaltungen';
 import VeranstaltungKategorien from './pages/VeranstaltungKategorien';
+import Wissen from './pages/Wissen';
+import AdminDashboard from './pages/AdminDashboard';
 import NotFound from './pages/NotFound';
 
 function App() {
@@ -203,6 +205,22 @@ function App() {
                 </ProtectedRoute>
               }
             />
+            <Route
+              path="/wissen"
+              element={
+                <ProtectedRoute>
+                  <Wissen />
+                </ProtectedRoute>
+              }
+            />
+            <Route
+              path="/admin"
+              element={
+                <ProtectedRoute>
+                  <AdminDashboard />
+                </ProtectedRoute>
+              }
+            />
             <Route path="*" element={<NotFound />} />
           </Routes>
         </AuthProvider>