```

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/business/service.py

@@ -10,6 +10,8 @@ from sqlalchemy import Select, func, select
 from sqlalchemy.sql.schema import Column
 from sqlalchemy.orm import Session
 
+from app.core.constants import ActorValue
+from app.modules.audit.constants import AuditRiskLevel, AuditSource
 from app.modules.audit.schemas import AuditLogCreate
 from app.modules.audit.service import AuditService
 from app.modules.approvals.service import ApprovalService
@@ -99,7 +101,7 @@ class BusinessService:
         self,
         domain: str,
         data: dict[str, Any],
-        actor: str = "api",
+        actor: str = ActorValue.API,
     ) -> dict[str, Any]:
         model = get_domain_model(domain)
         payload = _model_payload(model, data)
@@ -111,7 +113,7 @@ class BusinessService:
         self.audit.log(
             AuditLogCreate(
                 actor=actor,
-                source="api",
+                source=AuditSource.API,
                 action=f"create:{domain}",
                 target_type=domain,
                 target_id=str(record.id),
@@ -126,7 +128,7 @@ class BusinessService:
         domain: str,
         record_id: int,
         data: dict[str, Any],
-        actor: str = "api",
+        actor: str = ActorValue.API,
         approval_ticket_id: str | None = None,
     ) -> dict[str, Any]:
         if domain in HIGH_RISK_DOMAINS:
@@ -160,11 +162,13 @@ class BusinessService:
         self.audit.log(
             AuditLogCreate(
                 actor=actor,
-                source="api",
+                source=AuditSource.API,
                 action=f"update:{domain}",
                 target_type=domain,
                 target_id=str(record.id),
-                risk_level="high" if domain in HIGH_RISK_DOMAINS else "low",
+                risk_level=(
+                    AuditRiskLevel.HIGH if domain in HIGH_RISK_DOMAINS else AuditRiskLevel.LOW
+                ),
                 request_payload={"data": data, "approval_ticket_id": approval_ticket_id},
                 response_payload=result,
             )