fix dataset operator (#6064)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/services/feature_service.py

@@ -30,6 +30,7 @@ class FeatureModel(BaseModel):
     docs_processing: str = 'standard'
     can_replace_logo: bool = False
     model_load_balancing_enabled: bool = False
+    dataset_operator_enabled: bool = False
 
     # pydantic configs
     model_config = ConfigDict(protected_namespaces=())
@@ -68,6 +69,7 @@ class FeatureService:
     def _fulfill_params_from_env(cls, features: FeatureModel):
         features.can_replace_logo = current_app.config['CAN_REPLACE_LOGO']
         features.model_load_balancing_enabled = current_app.config['MODEL_LB_ENABLED']
+        features.dataset_operator_enabled = current_app.config['DATASET_OPERATOR_ENABLED']
 
     @classmethod
     def _fulfill_params_from_billing_api(cls, features: FeatureModel, tenant_id: str):