fix(api): switch dataset query created_by_role to CreatorUserRole enums

Note: `CreatorUserRole.END_USER` is `"end_user"` (underscore), matching the prior value.

Tests not run (not requested).

api/core/callback_handler/index_tool_callback_handler.py

@@ -12,7 +12,7 @@ from core.rag.models.document import Document
 from extensions.ext_database import db
 from models.dataset import ChildChunk, DatasetQuery, DocumentSegment
 from models.dataset import Document as DatasetDocument
-from models.enums import UserFrom
+from models.enums import CreatorUserRole
 
 _logger = logging.getLogger(__name__)
 
@@ -39,9 +39,9 @@ class DatasetIndexToolCallbackHandler:
             source="app",
             source_app_id=self._app_id,
             created_by_role=(
-                UserFrom.ACCOUNT
+                CreatorUserRole.ACCOUNT
                 if self._invoke_from in {InvokeFrom.EXPLORE, InvokeFrom.DEBUGGER}
-                else UserFrom.END_USER
+                else CreatorUserRole.END_USER
             ),
             created_by=self._user_id,
         )