- Move jwt_service.py from packages/domain/auth to packages/application/auth
- Move password_hasher.py from packages/domain/auth to packages/application/auth
- Update all import paths in use cases and tests
- Implement JWTService class with access_token and refresh_token support
- Add token type validation (access vs refresh)
- Add comprehensive unit tests (9 tests all passed)
- Install PyJWT dependency
Phase 4 Task 1/68 completed