[Feature] 自动备份数据库

[WindDrift]

Checklist

• I have already read docs/Tips.md, but my feature is not implemented.
• My suggested feature was not mentioned by others, and it is not a duplicate feature.

Summary

备份数据库需要手动点击按钮，希望增加自动备份功能以进一步确保数据安全。

Solution or Design

可以在【应用设置】——【文件管理】——【数据文件夹】中新增一个【自动备份数据库】的开关，然后可选自动备份周期，如每次启动Starward、每次启动游戏、每天、每周，甚至自定义。