feat(platform/backend): add latest grok models

[Bentlybro]

This PR adds some of the latest grok models to the platform
x-ai/grok-4-fast, x-ai/grok-4.1-fast and ai/grok-code-fast-1

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • Test all of the latest grok models to make sure they work and they do!

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Here's the code health analysis summary for commits 06d20e7..9d99590. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗
Python	✅ Success	❗ 10 occurences introduced 🎯 10 occurences resolved	View Check ↗

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