add gpt-4.1 mini and nano models

[alecf]

Just new models, no new functionality

All Submissions (required):

• Have you read the Contributing guidelines?
• Have you updated the documentation with pnpm docs?
• Have you ran the linter with pnpm lint:fix?
• Have you successfully ran the tests locally with pnpm test?
• Have you added a changeset file with pnpm changeset?
• Please link any relevant GitHub issue here.

See:

• https://platform.openai.com/docs/models/gpt-4.1-nano
• https://platform.openai.com/docs/models/gpt-4.1-mini

[alecf]

@RPate97 friendly ping

[alecf]

@RPate97 friendly ping...

[henry-lang]

Can we please merge this in?

[henry-lang]

?