Implement Google SSO Authentication System #7
Description
Implement Google OAuth 2.0 authentication system with JWT token management, user domain validation, and logout functionality.
Acceptance Criteria (COMPLETED)
- Google OAuth 2.0 integration with authorization code flow
- JWT token creation and validation
- User domain validation (joshsoftware.com)
- Logout functionality with token invalidation
- User info endpoint (/api/v1/auth/me)
- Comprehensive test coverage