chore(api/core): apply ruff reformatting (#7624)

api/core/rag/cleaner/cleaner_base.py

@@ -1,12 +1,11 @@
 """Abstract interface for document cleaner implementations."""
+
 from abc import ABC, abstractmethod
 
 
 class BaseCleaner(ABC):
-    """Interface for clean chunk content.
-    """
+    """Interface for clean chunk content."""
 
     @abstractmethod
     def clean(self, content: str):
         raise NotImplementedError
-