Phase 1: Auth + User Model

[ed-morais]

Goal

User registration, login, JWT auth, and user profiles — the foundation everything else builds on.

Checklist

• Functional test: Alex discovers Ima, creates an account, and logs in
• User model (extends AbstractUser with email as primary identifier)
• UserProfile model (timezone, ADHD preferences, onboarding complete flag)
• Registration API endpoint
• Login API endpoint (JWT)
• Token refresh endpoint
• Frontend: Register page
• Frontend: Login page
• Frontend: Protected route wrapper
• Frontend: Auth store (Zustand)

Branch

feat/auth

Closes

Closes #1 (after Phase 0 is merged)