Add a built in model explorer/downloader

Is your feature request related to a problem? Please describe. It can be annoying to have to find ai models, download them, and transfer them to the correct file locations.

Describe the solution you'd like I would like there to be a built in model explorer, similar to stability matrix. It could use civarchive, which aggregates models from places like civicai, hugging face, and others.

Describe alternatives you've considered I have used civarchive to find models, but it would be more streamlined to have a built in viewer.

Additional context I really like this project! Not sure if this has been already requested (I looked through GitHub issues but didn’t find anything).