feat: PLM backend services - auth, user, project, config services
Sprint 0 backend development complete:
- auth-service: JWT authentication, login/logout, token refresh
- user-service: User CRUD, profile management, RBAC
- project-service: Project lifecycle, member management
- config-service: System configuration, audit logging
Technical stack:
- FastAPI async framework
- SQLAlchemy 2.0 async ORM
- JWT authentication with python-jose
- bcrypt password hashing
- Pydantic v2 validation
API endpoints: 31 total
Code lines: 3,551
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