fix: dataset doc-form compatible (#24177)

Co-authored-by: huangzhuo <huangzhuo1@xiaomi.com>

api/services/dataset_service.py

         dataset: Optional[Dataset] = db.session.query(Dataset).filter_by(id=dataset_id).first()
         return dataset
 
+    @staticmethod
+    def check_doc_form(dataset: Dataset, doc_form: str):
+        if dataset.doc_form and doc_form != dataset.doc_form:
+            raise ValueError("doc_form is different from the dataset doc_form.")
+
     @staticmethod
     def check_dataset_model_setting(dataset):
         if dataset.indexing_technique == "high_quality":
         dataset_process_rule: Optional[DatasetProcessRule] = None,
         created_from: str = "web",
     ):
+        # check doc_form
+        DatasetService.check_doc_form(dataset, knowledge_config.doc_form)
         # check document limit
         features = FeatureService.get_features(current_user.current_tenant_id)