feat: add JWT authentication, user registration, and device management
- AuthService with register, login, refresh token flows
- JWT strategy + guard (Passport)
- User, Home, Device services
- REST endpoints: /auth/register, /auth/login, /auth/me, /auth/refresh
- Device registration with long-lived JWT tokens (365d)
- Device listing per home
- bcrypt password hashing (cost 12) and device token hashing
- Fix snake_case column names on all entity date columns
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
0115669464