fix: Use LARGE models for responses

[lalalune]

This PR makes the small models big. Apparently we've been using small models for interactions and message responses, but this is wrong.

[monilpat]

LGTM! Thanks so much for doing this :) Was always confused by this lol - appreciate the fix!

[seanbhart]

Why hardcode any values? Hardcoding makes the model settings very limited and forces developers to fork the library just to use a different model. Allowing them to be set in the character file is much more useful. This is what the character file model settings used to look like:

{
    "settings": {
        "model": "medium",
        "temperature": 0.45
    }
}

This PR allows this much more flexible approach:
#845