RSS feed is navigating to the Glance domain instead of the remote domain

### Description

I have the Godot RSS feed set up as such:
```
- type: rss
title: Tech
feeds:
- url: https://www.backblaze.com/blog/rss
title: Backblaze
- url: https://godotengine.org/rss.xml
title: Godot
```

However, the images are attempting to access the path on the Glance domain, instead of the remote domain. For example, instead of accessing `https://godotengine.org/storage/blog/covers/release-candidate-godot-4-5-rc-1.webp`, Glance will attempt to access `https://glance.mydomain.com/storage/blog/covers/release-candidate-godot-4-5-rc-1.webp`, despite the fact that the RSS feed (`https://godotengine.org/rss.xml`) explicitly includes the entire remote URL. Therefore, the image just shows as this:

Version is [Glance v0.8.4](https://github.com/glanceapp/glance), and this happens across both Chrome and Firefox. The HTML looks something like this:

Reproduce the issue with the provided RSS configuration and trace how RSS image URLs are parsed and rendered. Verify the Godot image URL is kept as its complete remote URL rather than being resolved against the Glance domain, then confirm the feed displays the image correctly.

Written by the indexing model from the issue text.