security(api): enforce privilege validation for dataset-to-pipeline transformation

The transformation from classic dataset to knowledge pipeline represents an irreversible
write operation that permanently alters the dataset structure. To prevent unauthorized
modifications, this change implements strict privilege validation in `RagPipelineTransformApi`.

Only users with editor privileges or dataset operator roles are authorized to execute
this transformation, ensuring proper access control for this critical operation.

api/controllers/console/datasets/rag_pipeline/rag_pipeline_workflow.py

@@ -950,6 +950,12 @@ class RagPipelineTransformApi(Resource):
     @login_required
     @account_initialization_required
     def post(self, dataset_id):
+        if not isinstance(current_user, Account):
+            raise Forbidden()
+
+        if not (current_user.is_editor or current_user.is_dataset_operator):
+            raise Forbidden()
+
         dataset_id = str(dataset_id)
         rag_pipeline_transform_service = RagPipelineTransformService()
         result = rag_pipeline_transform_service.transform_dataset(dataset_id)