```

feat: 添加飞书集成和审计API密钥认证

- 在数据库配置中添加飞书模型导入
- 添加审计API密钥配置项和认证中间件
- 实现飞书事件重复处理防止机制
- 为审批路由添加API密钥认证
- 优化AI适配器错误处理并添加JSON解析异常捕获
- 更新测试用例以包含新的认证和事件处理逻辑
```

app/core/security.py

@@ -53,3 +53,25 @@ def require_approval_api_key(
             detail="Invalid approval API key",
         )
     return ApiPrincipal(actor=settings.approval_api_actor)
+
+
+def require_audit_api_key(
+    x_audit_api_key: str | None = Header(
+        default=None,
+        alias=HttpHeader.X_AUDIT_API_KEY,
+    ),
+) -> ApiPrincipal:
+    """Validate the audit API key and return the audit principal."""
+
+    settings = get_settings()
+    if not settings.audit_api_key:
+        raise HTTPException(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            detail="AUDIT_API_KEY is required",
+        )
+    if not x_audit_api_key or not compare_digest(x_audit_api_key, settings.audit_api_key):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid audit API key",
+        )
+    return ApiPrincipal(actor=settings.audit_api_actor)