fix(api)!: Stop model prior to deletion

[nanoandrew4]

Description

This PR fixes the following:

• Model being stopped before deletion. Before the model would remain loaded in memory with no way to stop it once it had been deleted.
• Fix non-VL LFM models requiring mmproj file, when they don't, causing them to fail to run. It's my first time touching the gallery files, let me know if I've messed it up.

It also makes the following QoL improvements:

• Limit the capabilities reporting log to once per application execution, to avoid log spam
• Make some GH Actions only run on the main repo, to avoid failed runs on our forks

Signed commits

• Yes, I signed my commits.

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[mudler]

Looking good, thanks for taking a stab at it!