feat(api): Add user authentication functionality

- Implement JWT-based user authentication logic
- Add login endpoint and token validation middleware
- Update API routes with authentication dependencies
- Add authentication-related environment variables
- Optimize requirements.txt with necessary dependencies

lightrag/api/requirements.txt

@@ -8,3 +8,15 @@ python-multipart
 tenacity
 tiktoken
 uvicorn
+tqdm
+jiter
+httpcore
+distro
+httpx
+openai
+asyncpg
+neo4j
+pytz
+python-jose[cryptography]
+passlib[bcrypt]
+PyJWT