- Add Zod validation schemas for auth operations
- Add server actions for register, login, reset, update password
- Add clsx and tailwind-merge for class utilities
- Password validation: 8+ chars, 1 number, 1 uppercase
- Error messages in Italian per user requirement
- Specific error messages (not generic 'invalid credentials')
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>