Support ModelName Settings

[wangyumu]

User can config the Model Name in Settings to test GPT4-o or other new models like below:

and the default value keep the same as before.

for #90

[vercel[bot]]

@wangyumu is attempting to deploy a commit to the HaiTao Wu's projects Team on Vercel.

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[oleteacher]

This would be wonderful addition, using this in classroom and ability to switch models needed bad. Where can this mod be found?

Thank you!