Add support for homepage widget

Add widget to [homepage](https://github.com/gethomepage/homepage)

The issue mentions adding a widget to the homepage, referencing the Homepage project. First, examine the existing frontend structure in the repository to understand how widgets are currently implemented or where they should be added. Look for any related UI components or configuration files. Determine what data the widget should display and how it integrates with the monitoring backend. Check if there are any existing tests for widgets to understand the expected behavior.

索引モデルが issue の本文から書いたものです。