[Feature] 智能体日志清理策略加个全局配置

[jstbw]

MaxKB Version

2.10.1lts

Please describe your needs or suggestions for improvements

当前智能体的日志清理策略是按当前智能体设计并默认180天，想要全部智能体的日志留存久点一个个的设置太多了很麻烦，急需一个全局配置入口

Please describe the solution you suggest

No response

Additional Information

No response

[Binx98]

@baixin513 我可以提交这个功能PR