Adding nebius to roocode

[daniel-lxs]

Important

Add Nebius as a new provider with model handling, API configuration, and UI integration.

• Behavior:
  • Add Nebius as a new provider option in new-run.tsx and provider-settings.ts.
  • Handle Nebius API key and model ID in webviewMessageHandler.ts.
  • Add Nebius to provider validation in validate.ts.
• Models:
  • Define Nebius models and default model info in api.ts.
  • Add Nebius model fetching logic in fetchers/nebius.ts.
  • Include Nebius in useSelectedModel.ts and modelCache.ts.
• UI:
  • Add Nebius provider UI components in ApiOptions.tsx, ModelPicker.tsx, and providers/Nebius.tsx.
  • Update provider list and constants in constants.ts and index.ts.

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[mrubens]

Not sure if I messed something up, but I don't think this one is quite ready.

[daniel-lxs]

I'll be closing this since Nebius seems OpenAI compatible, I don't see a reason to add this as of now.

This can be reopened if necessary.