```

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/modules/feishu/schemas.py

@@ -2,19 +2,22 @@ from typing import Any
 
 from pydantic import BaseModel, Field
 
+from app.core.constants import ActorValue
+from app.modules.feishu.constants import FeishuReceiveIdType
+
 
 class FeishuTextMessage(BaseModel):
     receive_id: str | None = Field(
         default=None,
         description="chat_id or open_id depending on type.",
     )
-    receive_id_type: str = "chat_id"
+    receive_id_type: str = FeishuReceiveIdType.CHAT_ID
     text: str
 
 
 class FeishuCardMessage(BaseModel):
     receive_id: str | None = None
-    receive_id_type: str = "chat_id"
+    receive_id_type: str = FeishuReceiveIdType.CHAT_ID
     card: dict[str, Any]
 
 
@@ -35,7 +38,7 @@ class FeishuSendResult(BaseModel):
 class FeishuCommandRequest(BaseModel):
     text: str
     chat_id: str | None = None
-    actor: str = "api"
+    actor: str = ActorValue.API
     auto_reply: bool = False