```

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/constants.py

@@ -0,0 +1,40 @@
+from enum import StrEnum
+
+
+class FeishuReceiveIdType(StrEnum):
+    CHAT_ID = "chat_id"
+
+
+class FeishuMessageType(StrEnum):
+    TEXT = "text"
+    INTERACTIVE = "interactive"
+
+
+class FeishuPayloadKey(StrEnum):
+    RECEIVE_ID = "receive_id"
+    RECEIVE_ID_TYPE = "receive_id_type"
+    MESSAGE_TYPE = "msg_type"
+    CONTENT = "content"
+    TEXT = "text"
+    CODE = "code"
+    TENANT_ACCESS_TOKEN = "tenant_access_token"
+    EXPIRE = "expire"
+    APP_ID = "app_id"
+    APP_SECRET = "app_secret"
+    FEISHU_ERROR = "feishu_error"
+    CARD = "card"
+
+
+class FeishuCommandKey(StrEnum):
+    TEXT = "text"
+    CHAT_ID = "chat_id"
+    ACTOR = "actor"
+
+
+FEISHU_TENANT_TOKEN_PATH = "/auth/v3/tenant_access_token/internal"
+FEISHU_MESSAGE_PATH = "/im/v1/messages"
+FEISHU_AUTH_MISSING = "Feishu app credentials are not configured"
+FEISHU_RECEIVE_ID_MISSING = "receive_id or FEISHU_DEFAULT_CHAT_ID is required"
+FEISHU_SUCCESS_CODE = 0
+FEISHU_DEFAULT_TOKEN_EXPIRE_SECONDS = 7200
+FEISHU_TOKEN_EXPIRE_SAFETY_SECONDS = 300