```

feat(ai_agent): 完善AI适配器和服务功能

- 添加OpenClaw和Hermes健康检查接口
- 实现OpenClaw工具调用功能
- 重构AI适配器使用常量定义
- 增加AI技能系统支持
- 更新配置文件中的默认模型提供者设置

refactor(scheduler): 使用常量替换硬编码值

- 将硬编码的actor值替换为ActorValue常量
- 将receive_id_type替换为FeishuReceiveIdType枚举

refactor(audit): 统一审计日志常量使用

- 将硬编码的actor、source、risk_level等值替换为对应常量
- 更新审核服务中的状态和操作常量引用

refactor(approvals): 标准化审批模块常量使用

- 将applicant默认值替换为ActorValue.API常量
- 使用ApprovalStatus常量替代硬编码状态值
- 更新审核操作常量引用
```

app/core/scheduler.py

@@ -1,6 +1,8 @@
 from fastapi import FastAPI
 
+from app.core.constants import ActorValue
 from app.core.config import get_settings
+from app.modules.feishu.constants import FeishuReceiveIdType
 
 
 def attach_scheduler(app: FastAPI) -> None:
@@ -30,8 +32,8 @@ def attach_scheduler(app: FastAPI) -> None:
                 ReportService(db).push_report(
                     report,
                     receive_id=settings.feishu_default_chat_id,
-                    receive_id_type="chat_id",
-                    actor="scheduler",
+                    receive_id_type=FeishuReceiveIdType.CHAT_ID,
+                    actor=ActorValue.SCHEDULER,
                 )
         finally:
             db.close()
@@ -49,8 +51,8 @@ def attach_scheduler(app: FastAPI) -> None:
                 ReportService(db).push_report(
                     report,
                     receive_id=settings.feishu_default_chat_id,
-                    receive_id_type="chat_id",
-                    actor="scheduler",
+                    receive_id_type=FeishuReceiveIdType.CHAT_ID,
+                    actor=ActorValue.SCHEDULER,
                 )
         finally:
             db.close()