refactor: unify workflow runtime boundary

app/startup/initializers/workflow.py

@@ -1,6 +1,11 @@
+from app.application.workflow import configure_workflow_runtime
 from app.workflow import WorkFlowManager
 
 
+# 启动模块是 concrete WorkFlowManager 的唯一宿主装配边界。
+configure_workflow_runtime(lambda: WorkFlowManager())
+
+
 def init_workflow():
     """
     初始化工作流