[Feature request] Dashboard (aka "Quick Stats") view

Basically what title says, and what "other software" has - a dashboard, aka "Quick Stats". This means the following:

1. Count of how many services are up, down, maintenance, unknown and paused
2. List of last events from all services

该请求是一个显示服务状态计数和最近事件的仪表板视图。首先检查现有的服务状态数据模型和事件日志记录。查看当前的 UI 组件，以了解如何添加新视图。确定在何处聚合计数并获取所有服务的最后事件。“完成”意味着新页面或新部分显示了所请求的两条信息。

由索引模型根据 Issue 内容生成。