Currently discussing this with my Bulgarian partner, apparently this is a normal breakfast in tomato Europe, either with or without feta cheese. I'm from potato Europe and have never heard of this madness!
Jan.ai might be a good starting point or ollama? There's https://tales.fromprod.com/2024/111/using-your-own-hardware-for-llms.html which has some guidance for using jan.ai for both server and client
Is that image AI generated? There are a different number of columns at the top compared to the bottom
You're looking for something to export the image at a lower resolution (resize) rather than something to compress the image. Any open source gallery/image editing app should be able to do this.
One example would be "image toolbox" on FDroid. I've not used it but it seems to have the feature you need