fix: restore tool protocol selector for OpenAI Compatible provider

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Related GitHub Issue

Closes: #10246

Description

This PR attempts to address Issue #10246 where users with third-party API providers (OpenAI Compatible) are unable to switch between Native and XML tool protocols after the XML protocol was deprecated in PR #10281.

The Problem:
PR #10281 removed the Tool Protocol selector from the UI and forced all providers to use Native tool calling. However, many third-party API proxies do not fully support native tool calling, causing errors like:

• "The model provided text/reasoning but did not call any required tools"
• JSON Schema validation errors

The Solution:
This PR re-adds the Tool Protocol selector specifically for OpenAI Compatible providers, allowing users to manually select XML protocol as a workaround when their third-party proxy does not support native tool calling.

Changes:

• Added Tool Protocol selector to OpenAICompatible.tsx
• Updated resolveToolProtocol() to respect user preference for openai provider
• Added tests for OpenAI Compatible provider tool protocol selection

Behavior:

Provider	User Preference	Result
OpenAI Compatible	XML	Uses XML protocol
OpenAI Compatible	Native	Uses Native protocol
OpenAI Compatible	Not set	Uses Native (default)
Other providers	Any	Always uses Native
Resumed tasks	Any	Uses locked protocol

Test Procedure

1. Run unit tests: cd src && npx vitest run utils/__tests__/resolveToolProtocol.spec.ts
2. TypeScript checks: cd src && npx tsc --noEmit --skipLibCheck
3. TypeScript checks (webview): cd webview-ui && npx tsc --noEmit --skipLibCheck

Manual testing:

1. Select OpenAI Compatible provider
2. Verify Tool Protocol selector is visible in the settings
3. Select XML protocol and verify tool calls use XML format
4. Select Native protocol and verify tool calls use native format

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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Review completed. No issues found.

Summary:

• Type consistency verified - toolProtocol field properly typed
• i18n translations exist for all used keys
• Logic correctly implements precedence order (locked > user preference for openai > native default)
• Test coverage is comprehensive
• UI component properly handles value mapping

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