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/routers/document_routes.py

@@ -16,10 +16,9 @@ from pydantic import BaseModel, Field, field_validator
 
 from lightrag import LightRAG
 from lightrag.base import DocProcessingStatus, DocStatus
-from ..utils_api import get_api_key_dependency
+from ..utils_api import get_api_key_dependency, get_auth_dependency
 
-
-router = APIRouter(prefix="/documents", tags=["documents"])
+router = APIRouter(prefix="/documents", tags=["documents"], dependencies=[Depends(get_auth_dependency())])
 
 # Temporary file prefix
 temp_prefix = "__tmp__"