feat: add Users and Settings nav items and routes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/App.jsx

@@ -16,6 +16,8 @@ const AdminLayout = React.lazy(() => import('./admin/layout/AdminLayout'));
 const KanbanBoard = React.lazy(() => import('./admin/orders/KanbanBoard'));
 const AnalyticsDashboard = React.lazy(() => import('./admin/analytics/AnalyticsDashboard'));
 const CompletedOrdersTable = React.lazy(() => import('./admin/analytics/CompletedOrdersTable'));
+const UserManagementPage = React.lazy(() => import('./admin/users/UserManagementPage'));
+const SettingsPage = React.lazy(() => import('./admin/settings/SettingsPage'));
 
 function PublicSite() {
   return (
@@ -48,6 +50,8 @@ function App() {
               <Route path="kanban" element={<KanbanBoard />} />
               <Route path="analytics" element={<AnalyticsDashboard />} />
               <Route path="completed" element={<CompletedOrdersTable />} />
+              <Route path="users" element={<UserManagementPage />} />
+              <Route path="settings" element={<SettingsPage />} />
             </Route>
           </Route>
         </Routes>