Phase 4: Authentication System (T039-T048)

Implemented complete JWT-based authentication system with RBAC:

**Tests (TDD Approach):**
- Created contract tests for /api/v1/auth/login endpoint
- Created contract tests for /api/v1/auth/logout endpoint
- Created unit tests for AuthService (login, logout, validate_token, password hashing)
- Created pytest configuration and fixtures (test DB, test users, tokens)

**Schemas:**
- LoginRequest: username/password validation
- TokenResponse: access_token, refresh_token, user info
- LogoutResponse: logout confirmation
- RefreshTokenRequest: token refresh payload
- UserInfo: user data (excludes password_hash)

**Services:**
- AuthService: login(), logout(), validate_token(), hash_password(), verify_password()
- Integrated bcrypt password hashing
- JWT token generation (access + refresh tokens)
- Token blacklisting in Redis
- Audit logging for all auth operations

**Middleware:**
- Authentication middleware with JWT validation
- Role-based access control (RBAC) helpers
- require_role() dependency factory
- Convenience dependencies: require_viewer(), require_operator(), require_administrator()
- Client IP and User-Agent extraction

**Router:**
- POST /api/v1/auth/login - Authenticate and get tokens
- POST /api/v1/auth/logout - Blacklist token
- POST /api/v1/auth/refresh - Refresh access token
- GET /api/v1/auth/me - Get current user info

**Integration:**
- Registered auth router in main.py
- Updated startup event to initialize Redis and SDK Bridge clients
- Updated shutdown event to cleanup connections properly
- Fixed error translation utilities
- Added asyncpg dependency for PostgreSQL async driver

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

requirements.txt

@@ -7,6 +7,7 @@ python-multipart==0.0.6
 sqlalchemy==2.0.25
 alembic==1.13.1
 psycopg2-binary==2.9.9
+asyncpg==0.29.0
 
 # Redis
 redis==5.0.1