feat: add new models and update configurations for vscode-lm

[NaccOll]

update model info in vscode-lm

---

Important

Add new models claude-4-sonnet and gpt-5-mini, and update configurations for existing models in vscode-llm.ts.

• Models Added:
  • claude-4-sonnet and gpt-5-mini added to vscodeLlmModels in vscode-llm.ts.
• Model Updates:
  • gemini-2.5-pro, o4-mini, and gpt-4.1 models updated with contextWindow set to 128000 and maxInputTokens adjusted.
• Misc:
  • gpt-5 model added with contextWindow 128000 and maxInputTokens 108637.

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[roomote]

Thank you for your contribution! I've reviewed the changes and found several issues that need attention before this can be merged.

[roomote]

Could you add a comment explaining why the contextWindow was increased from 63830 to 128000? This is a significant change that might affect existing users of this model.

[daniel-lxs]

Thank you @NaccOll!