Add a auto-model-changer

[malteroggenberg]

Love the app and it works so great for me! I was wondering if there are any plans for making the language model change to another preselected model wheneever it uses more than the free contingent.
I'm using Groqs GPT-OSS 20B which does a good job, but after more or less much talking I reach my limit there for the 20B model. Then I have to switch to the 120B model which is great aswell. It s just some manual effort and I feel like there is room for improvement.

An option for auto-model-changer aswell as maybe an api key switcher after a certain usage would be cool!