refactor: tool response to generator

api/core/workflow/nodes/tool/entities.py

@@ -3,12 +3,13 @@ from typing import Any, Literal, Union
 from pydantic import BaseModel, field_validator
 from pydantic_core.core_schema import ValidationInfo
 
+from core.tools.entities.tool_entities import ToolProviderType
 from core.workflow.entities.base_node_data_entities import BaseNodeData
 
 
 class ToolEntity(BaseModel):
     provider_id: str
-    provider_type: Literal['builtin', 'api', 'workflow']
+    provider_type: ToolProviderType
     provider_name: str # redundancy
     tool_name: str
     tool_label: str # redundancy

api/core/workflow/nodes/tool/tool_node.py

@@ -32,7 +32,7 @@ class ToolNode(BaseNode):
 
         # fetch tool icon
         tool_info = {
-            'provider_type': node_data.provider_type,
+            'provider_type': node_data.provider_type.value,
             'provider_id': node_data.provider_id
         }