refactor(api): Fix issues reported by pre-commit

- Modified code layout and formatting in multiple files, improving code readability.
  - Updated import statements, removing unused libraries.
  - Simplified the writing of some functions and exception handling.

lightrag/api/routers/document_routes.py

@@ -18,7 +18,11 @@ from lightrag import LightRAG
 from lightrag.base import DocProcessingStatus, DocStatus
 from ..utils_api import get_api_key_dependency, get_auth_dependency
 
-router = APIRouter(prefix="/documents", tags=["documents"], dependencies=[Depends(get_auth_dependency())])
+router = APIRouter(
+    prefix="/documents",
+    tags=["documents"],
+    dependencies=[Depends(get_auth_dependency())],
+)
 
 # Temporary file prefix
 temp_prefix = "__tmp__"