refactor: remove print statement from AuthDependency error handling

- Eliminated the print statement for authentication errors in AuthDependency to streamline error handling and reduce console clutter.

Author: atyrode

src/backend/dependencies.py

@@ -137,7 +137,6 @@ def _handle_auth_error(self, detail: str, status_code: int = 401) -> Optional[No
         """Handle authentication errors based on auto_error setting"""
         if self.auto_error:
             headers = {"WWW-Authenticate": "Bearer"} if status_code == 401 else None
-            print(f"Authentication error: {detail}")
             raise HTTPException(
                 status_code=status_code,
                 detail=detail,