Updte vercel default models

[JonasHelming]

What it does

• Updates Vercel default models to the same as native providers

How to test

Use all default models

Follow-ups

@planger : GPT 5 and higher did not work for me with vercel. Could you maybe drive the decision on whether to fix this or whether to remove vercel or mark it as not compatible with >GPT 5 (ideally before mergeing this)

Breaking changes

• This PR introduces breaking changes and requires careful review. If yes, the breaking changes section in the changelog has been updated.

Attribution

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines
• User-facing text is internationalized using the nls service (for details, please see the Internationalization/Localization section in the Coding Guidelines)

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[JonasHelming]

@sdirix