- Add adminStore with Zustand for authentication state persistence
- Add adminApi service for all admin endpoints
- Add Login page with error handling and redirect
- Add AdminLayout with sidebar navigation and route protection
- Add Dashboard with stats and quick actions
- Add Questions page with full CRUD, filters, and AI generation modal
- Add Calendar page for scheduling questions by date
- Integrate admin routes in App.tsx with nested routing
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
