refactor: 推进后端分层架构治理

app/monitor/dispatcher.py

@@ -14,7 +14,7 @@ from app.application.history import (HistoryGateAction, describe_history_gate,
                                         max_failed_retries, resolve_history)
 from app.runtime.log import logger
 from app.adapters.system.fsproxy import fsproxy
-from app.schemas import FileItem
+from app.schemas.workflow import FileItem
 from app.schemas.types import MediaType