feat: add option to omit tool_choice param for Azure/LiteLLM compatibility

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Related GitHub Issue

Closes: #10701

Description

This PR attempts to address Issue #10701 by adding a new openAiOmitToolChoice setting to the OpenAI provider schema.

Changes:

• Added openAiOmitToolChoice: z.boolean().optional() to the openAiSchema in packages/types/src/provider-settings.ts
• Modified src/api/providers/openai.ts to check for this setting before including tool_choice in API requests (in all 4 places where tool_choice is used)
• Added a checkbox UI control in webview-ui/src/components/settings/providers/OpenAICompatible.tsx
• Added localization strings in webview-ui/src/i18n/locales/en/settings.json

When enabled, the setting will omit the tool_choice parameter from API requests, allowing users with Azure-hosted models (like GPT-5) accessed through LiteLLM proxies to avoid 400 errors.

Test Procedure

1. Configure an OpenAI-compatible provider with an Azure/LiteLLM endpoint that does not support tool_choice
2. Enable the "Omit tool_choice parameter" checkbox in provider settings
3. Send a request - it should now succeed without the 400 error about unsupported parameters

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

• No documentation updates are required.

Additional Notes

Feedback and guidance are welcome!

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Important

Adds openAiOmitToolChoice setting to omit tool_choice parameter for Azure/LiteLLM compatibility, with changes in API handling, UI, and localization.

• Behavior:
  • Adds openAiOmitToolChoice to openAiSchema in provider-settings.ts to optionally omit tool_choice in API requests.
  • Updates OpenAiHandler in openai.ts to check openAiOmitToolChoice before including tool_choice in requests.
• UI:
  • Adds checkbox for "Omit tool_choice parameter" in OpenAICompatible.tsx.
• Localization:
  • Adds strings for "omitToolChoice" and "omitToolChoiceTips" in settings.json.

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Rooviewer   See task on Roo Cloud

Reviewed all changes. No issues found.

The implementation correctly adds the openAiOmitToolChoice setting to conditionally omit the tool_choice parameter from API requests for Azure/LiteLLM compatibility. The changes are consistent with existing patterns and backward compatible.

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