Add GPT-o3 and GPT-o4-mini

[SteshinSS]

Hey, could you please add the new models?

[ianarawjo]

We will get around to it! In the meantime, you can manually enter them in the models field after adding an OpenAI model -> go to model Settings. Let us know if you encounter any problems!

[SteshinSS]

Yes, that worked, thanks! Might be useful to have this trick in the docs