```

feat: 添加公司AI管理平台基础架构

添加了完整的FastAPI后端项目结构，包括：
- 环境配置文件(.env.example)和项目说明文档(README.md、AGENTS.md)
- Dockerfile用于容器化部署
- 核心基础设施：配置管理、数据库连接、调度器、安全认证
- 模块化设计：AI代理、审批流程、审计日志、业务台账等功能模块
- 支持多数据库连接(主库和遗留系统只读库)
- AI适配器支持OpenClaw、Hermes、OpenAI兼容接口
- 飞书集成、报表生成、风险监控等企业级功能
- 完整的依赖管理和测试指南
```

app/modules/audit/service.py

@@ -0,0 +1,46 @@
+import json
+from typing import Any
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.modules.audit.models import AuditLog
+from app.modules.audit.schemas import AuditLogCreate
+
+
+def _dump(value: Any | None) -> str | None:
+    """Serialize audit payloads while preserving existing strings."""
+
+    if value is None:
+        return None
+    if isinstance(value, str):
+        return value
+    return json.dumps(value, ensure_ascii=False, default=str)
+
+
+class AuditService:
+    """Persist and query audit log entries."""
+
+    def __init__(self, db: Session):
+        self.db = db
+
+    def log(self, payload: AuditLogCreate) -> AuditLog:
+        record = AuditLog(
+            actor=payload.actor,
+            source=payload.source,
+            action=payload.action,
+            target_type=payload.target_type,
+            target_id=payload.target_id,
+            risk_level=payload.risk_level,
+            request_payload=_dump(payload.request_payload),
+            response_payload=_dump(payload.response_payload),
+            status=payload.status,
+        )
+        self.db.add(record)
+        self.db.commit()
+        self.db.refresh(record)
+        return record
+
+    def list_logs(self, limit: int = 100) -> list[AuditLog]:
+        stmt = select(AuditLog).order_by(AuditLog.id.desc()).limit(min(limit, 500))
+        return list(self.db.execute(stmt).scalars())