refactor: unify host agent runtime access

app/scheduler.py

@@ -1580,7 +1580,7 @@ class Scheduler(ConfigReloadMixin, metaclass=SingletonClass):
         :param trigger_source: 触发入口，scheduled-自动调度，manual-显式立即执行
         :return: 执行是否成功及结果摘要
         """
-        from app.agent.runtime_loader import get_running_agent_manager
+        from app.application.agent import get_running_agent_manager
 
         try:
             manager = get_running_agent_manager()
@@ -1993,7 +1993,7 @@ class Scheduler(ConfigReloadMixin, metaclass=SingletonClass):
         """
         智能体心跳唤醒：检查并执行待处理的定时任务
         """
-        from app.agent.runtime_loader import get_running_agent_manager
+        from app.application.agent import get_running_agent_manager
 
         manager = get_running_agent_manager()
         if manager is None: