```

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/legacy_mysql/schemas.py

@@ -2,6 +2,8 @@ from typing import Any
 
 from pydantic import BaseModel, Field
 
+from app.core.constants import ActorValue
+
 
 class ReadonlyQueryRequest(BaseModel):
     """Readonly SQL query request for the legacy MySQL connection."""
@@ -41,7 +43,7 @@ class LegacyProjectSyncRequest(BaseModel):
     )
     limit: int = Field(default=100, ge=1, le=500)
     dry_run: bool = True
-    actor: str = "api"
+    actor: str = ActorValue.API
 
 
 class LegacyProjectSyncResult(BaseModel):

app/modules/legacy_mysql/service.py

@@ -9,10 +9,13 @@ from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
+from app.core.constants import ActorValue
 from app.core.config import get_settings
 from app.core.database import legacy_engine
+from app.modules.audit.constants import AuditAction, AuditRiskLevel, AuditSource, AuditStatus
 from app.modules.audit.schemas import AuditLogCreate
 from app.modules.audit.service import AuditService
+from app.modules.business.constants import BusinessDomain, SourceSystem, StatusValue
 from app.modules.business.models import LegacySyncRun, Project
 from app.modules.business.service import serialize_model
 
@@ -152,10 +155,10 @@ class LegacyMySQLService:
         return {
             "code": code,
             "external_id": str(external_id) if external_id is not None else code,
-            "source_system": "legacy_mysql",
+            "source_system": SourceSystem.LEGACY_MYSQL,
             "name": self._value(row, field_map, "name", "未命名项目"),
             "owner": self._value(row, field_map, "owner", None),
-            "status": self._value(row, field_map, "status", "未知"),
+            "status": self._value(row, field_map, "status", StatusValue.UNKNOWN),
             "progress_percent": int(
                 self._value(
                     row,
@@ -182,7 +185,7 @@ class LegacyMySQLService:
         field_map: dict[str, str] | None = None,
         limit: int = 100,
         dry_run: bool = True,
-        actor: str = "api",
+        actor: str = ActorValue.API,
     ) -> dict[str, Any]:
         if self.db is None:
             raise HTTPException(
@@ -216,7 +219,7 @@ class LegacyMySQLService:
                 continue
 
             stmt = select(Project).where(
-                Project.source_system == "legacy_mysql",
+                Project.source_system == SourceSystem.LEGACY_MYSQL,
                 Project.external_id == payload["external_id"],
             )
             record = self.db.execute(stmt).scalar_one_or_none()
@@ -258,9 +261,9 @@ class LegacyMySQLService:
         }
         sync_run = LegacySyncRun(
             code=f"SYNC-PROJECTS-{datetime.utcnow():%Y%m%d%H%M%S%f}",
-            domain="projects",
+            domain=BusinessDomain.PROJECTS,
             source_table="LEGACY_PROJECT_QUERY",
-            status="dry_run" if dry_run else "success",
+            status=StatusValue.DRY_RUN if dry_run else AuditStatus.SUCCESS,
             finished_at=datetime.utcnow(),
             created_count=created,
             updated_count=updated,
@@ -275,10 +278,10 @@ class LegacyMySQLService:
         AuditService(self.db).log(
             AuditLogCreate(
                 actor=actor,
-                source="legacy_mysql",
-                action="sync_projects",
-                target_type="projects",
-                risk_level="medium",
+                source=AuditSource.LEGACY_MYSQL,
+                action=AuditAction.LEGACY_SYNC_PROJECTS,
+                target_type=BusinessDomain.PROJECTS,
+                risk_level=AuditRiskLevel.MEDIUM,
                 request_payload={
                     "source_query": source_query or "LEGACY_PROJECT_QUERY",
                     "field_map": field_map,