feat: add Qwen/Qwen3-235B-A22B-Instruct-2507 model to Chutes AI provider

[roomote]

This PR adds support for the Qwen/Qwen3-235B-A22B-Instruct-2507 model to the Chutes AI provider, enabling users to leverage its massive 262,144 token context window for processing large documents and codebases.

Changes

• Added Qwen/Qwen3-235B-A22B-Instruct-2507 to the ChutesModelId type
• Added model configuration with 262,144 token context window to chutesModels
• Added test case to verify the new model configuration

Testing

• All existing tests pass
• Added specific test case for the new model configuration
• Type checking passes

Fixes #6050

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Important

Add Qwen/Qwen3-235B-A22B-Instruct-2507 model to Chutes AI provider with 262,144 token context window and verify with tests.

• Behavior:
  • Add Qwen/Qwen3-235B-A22B-Instruct-2507 to ChutesModelId in chutes.ts.
  • Configure model in chutesModels with 262,144 token context window.
• Testing:
  • Add test in chutes.spec.ts to verify Qwen/Qwen3-235B-A22B-Instruct-2507 configuration.
  • Ensure all existing tests pass and type checking is successful.

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