fix: workflow_as_tool output files raise error (#12061)

api/core/tools/tool/workflow_tool.py

 import json
 import logging
 from copy import deepcopy
-from typing import Any, Optional, Union
+from typing import Any, Optional, Union, cast
 
 from core.file import FILE_MODEL_IDENTITY, File, FileTransferMethod
 from core.tools.entities.tool_entities import ToolInvokeMessage, ToolParameter, ToolProviderType
 from core.tools.tool.tool import Tool
 from extensions.ext_database import db
+from factories.file_factory import build_from_mapping
 from models.account import Account
 from models.model import App, EndUser
 from models.workflow import Workflow
             if isinstance(value, list):
                 for item in value:
                     if isinstance(item, dict) and item.get("dify_model_identity") == FILE_MODEL_IDENTITY:
-                        file = File.model_validate(item)
+                        item["tool_file_id"] = item.get("related_id")
+                        file = build_from_mapping(
+                            mapping=item,
+                            tenant_id=str(cast(Tool.Runtime, self.runtime).tenant_id),
+                        )
                         files.append(file)
             elif isinstance(value, dict) and value.get("dify_model_identity") == FILE_MODEL_IDENTITY:
-                file = File.model_validate(value)
+                value["tool_file_id"] = value.get("related_id")
+                file = build_from_mapping(
+                    mapping=value,
+                    tenant_id=str(cast(Tool.Runtime, self.runtime).tenant_id),
+                )
                 files.append(file)
 
             result[key] = value