# Task: Authentication System

## Objective
Implement the user authentication system supporting the "Registered User" role and privacy controls.

## Steps
- [ ] Implement OAuth2 flow (Google/GitHub providers for MVP).
- [ ] Create User registration/login API endpoints.
- [ ] Implement JWT token issuance and validation.
- [ ] Create "Identity" model to allow one User to have multiple profiles (pseudonymity).
- [ ] Protect API routes with auth dependencies.

## Acceptance Criteria
- User can sign up and log in.
- Protected routes reject unauthenticated requests.
- User can create a second "Identity" profile.