🐛 Bug Fix:
- Replace req.json() with req.text() + JSON.parse() for Vercel compatibility
- Add proper error handling for malformed JSON requests
- Fix authentication endpoints (login/register) body parsing
- Fix admin users endpoint body parsing
🔧 Technical Details:
- Vercel functions don't support req.json() method directly
- Use req.text() to get raw body content then parse manually
- Add try/catch blocks for JSON parsing errors
- Maintain same API interface and error responses
✅ Endpoints Fixed:
- /api/auth/register - User registration
- /api/auth/login - User authentication
- /api/admin/users - Admin user management
This resolves the 'req.json is not a function' error in production.
✨ Features Added:
- User registration and login with JWT authentication
- Role-based access control (user/admin)
- Comprehensive admin panel with user management
- Password hashing with bcrypt
- Session management and token storage
- Protected routes and public routes
- Modern login/register forms with validation
🗄️ Database Schema:
- Users table with profile information
- Roles and permissions system
- User-role junction tables
- Session management tables
- Database triggers and indexes
🎨 UI/UX Improvements:
- Updated navigation with user menu
- Admin badge and access controls
- Responsive authentication forms
- Loading states and error handling
- Role-based UI elements
🔧 API Endpoints:
- /api/auth/login - User authentication
- /api/auth/register - User registration
- /api/admin/users - User management (admin only)
- /api/setup-auth - Database schema setup
🚀 Admin Panel Features:
- User listing with search and pagination
- Role assignment (user/admin)
- User activation/deactivation
- System dashboard with stats
- Card management placeholder
- Real-time user management
