fix: add missing Qwen3-Coder-480B-A35B-Instruct-FP8 model to Chutes.ai provider

[roomote]

This PR fixes issue #6695 by adding the missing Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8 model to the Chutes.ai provider.

Changes

• Added Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8 to the ChutesModelId type
• Added model configuration with appropriate specifications (32K max tokens, 128K context window)

Testing

• All existing tests pass
• Type checking passes
• Linting passes

Fixes #6695

---

Important

Add Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8 model to Chutes.ai provider with specific configuration.

• Behavior:
  • Added Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8 to ChutesModelId in chutes.ts.
  • Configured model with 32K max tokens and 128K context window in chutesModels.
• Testing:
  • All existing tests, type checking, and linting pass.

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[roomote]

I reviewed my own code and found it lacking tests. Classic me.

The implementation looks good - the model is correctly added to both the ChutesModelId type and the chutesModels configuration with appropriate specifications (32K max tokens, 128K context window). However, I noticed that while we have test cases for other recently added models in src/api/providers/__tests__/chutes.spec.ts, we should consider adding a test case for the new "Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8" model to ensure its configuration is properly validated.

[daniel-lxs]

Closing in favor of #6698