Implement Platform Superuser UI and Fix API Role Casing

- Update API to return lowercase roles for frontend compatibility
- Fix Tenant owner lookup in platform admin serializer
- Update frontend App.tsx to match tarball implementation
- Prioritize vite.config.js for HMR support
- Include pending CSP and CORS configuration updates

frontend/src/App.tsx

@@ -10,7 +10,6 @@ import { useCurrentUser, useMasquerade, useLogout } from './hooks/useAuth';
 import { useCurrentBusiness } from './hooks/useBusiness';
 import { useUpdateBusiness } from './hooks/useBusiness';
 import { setCookie } from './utils/cookies';
-import { DevQuickLogin } from './components/DevQuickLogin';
 
 // Import Login Page
 import LoginPage from './pages/LoginPage';
@@ -549,9 +548,8 @@ const App: React.FC = () => {
       <Router>
         <AppContent />
       </Router>
-      <DevQuickLogin />
     </QueryClientProvider>
   );
 };
 
-export default App;
+export default App;