feat: add NanoGPT as a provider

[0xGingi]

Description

This adds https://nano-gpt.com as a provider (This PR also has some changes to tui.test.ts as it was failing a test when attempting to commit to my repo)

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Ran npm run check (typecheck + lint + test)
• Tested the TUI flow manually
• Tested CLI commands

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code where necessary
• I have updated the documentation if needed
• My changes generate no new warnings
• I have added tests that prove my fix/feature works
• New and existing tests pass locally

[numman-ali]

Thanks for the PR!

You probably noticed I put in the new Claude Mirror provider

So you'll have conflicts

Do you mind if I do the work myself later or do you care of the contribution badge?

I think lots of feedback will come in and I need to coordinate and fix a few things most likely

[0xGingi]

Yeah all good, whatever works best for you!

[0xGingi]

I went ahead and dealt with the conflicts