Feat: let toc run asynchronizly... (#10513)

### What problem does this PR solve?

#10436 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/db/services/knowledgebase_service.py

@@ -397,9 +397,10 @@ class KnowledgebaseService(CommonService):
         else:
             kbs = kbs.order_by(cls.model.getter_by(orderby).asc())
 
+        total = kbs.count()
         kbs = kbs.paginate(page_number, items_per_page)
 
-        return list(kbs.dicts()), kbs.count()
+        return list(kbs.dicts()), total
 
     @classmethod
     @DB.connection_context()