style(backend): formatter 收口两处漏网文件（纯格式无行为变化）

Co-Authored-By: Claude Code <noreply@anthropic.com>

backend/app/repositories/ownership_log_repository.py

@@ -40,9 +40,7 @@ def list_by_ref(
     return list(session.execute(stmt).all())
 
 
-def count_by_ref(
-    session: Session, *, owner_type: int, ref_column, ref_id: int
-) -> int:
+def count_by_ref(session: Session, *, owner_type: int, ref_column, ref_id: int) -> int:
     """统计某引用对象的归属留痕总数，供分页使用。"""
     stmt = select(func.count(OwnershipChangeLog.id)).where(
         OwnershipChangeLog.owner_type == owner_type,