Fix React error #130 and backend event creation

Frontend fixes:
- Disable verbatimModuleSyntax in TypeScript config to fix module imports
- Add displayName to critical React components for better production debugging
- Configure Vite build with manual chunks for better code splitting
- Enable sourcemaps for production debugging

Backend fixes:
- Remove updated_at field from events table insert (column doesn't exist)
- Fix SQL error that was causing 500 errors on event creation

These changes resolve:
- React error #130 that occurred during login and event creation
- 500 Internal Server Error when creating new events
- Better error tracking in production builds

🤖 Generated with [Claude Code](https://claude.ai/code)

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

frontend/src/components/admin/AdminLayout.tsx

@@ -49,4 +49,6 @@ export const AdminLayout: React.FC = () => {
       </div>
     </div>
   );
-};
+};
+
+AdminLayout.displayName = 'AdminLayout';

frontend/src/pages/admin/AdminDashboard.tsx

@@ -311,4 +311,6 @@ export const AdminDashboard: React.FC = () => {
       </Card>
     </div>
   );
-};
+};
+
+AdminDashboard.displayName = 'AdminDashboard';

frontend/src/pages/admin/AdminLoginPage.tsx

@@ -210,4 +210,6 @@ export const AdminLoginPage: React.FC = () => {
       </div>
     </div>
   );
-};
+};
+
+AdminLoginPage.displayName = 'AdminLoginPage';

frontend/src/pages/admin/CreateEventPage.tsx

@@ -438,4 +438,6 @@ export const CreateEventPage: React.FC = () => {
       </form>
     </div>
   );
-};
+};
+
+CreateEventPage.displayName = 'CreateEventPage';