feat: add xhigh reasoning effort for gpt-5.1-codex-max

[andrewginns]

Related GitHub Issue

Closes: #9891

Description

• Adds "xhigh" to the reasoning effort setting schema and model capabilities
• Exposes "xhigh" only for gpt-5.1-codex-max in openAiNativeModels
• Adds an OpenAI Native test asserting the Responses request includes reasoning,effort: "xhigh"

Test Procedure

• pnpm --filter roo-cline test -- api/providers/__tests__/openai-native.spec.ts

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

[roomote]

Rooviewer   See task on Roo Cloud

Re-review completed. The localization commit properly translates "Extra high" reasoning effort label across all 17 supported languages. All translations are semantically accurate and consistent with the existing implementation.

Previous reviews

• c5cf3c3: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[andrewginns]

@roomote review the localisation translations

[roomote]

Fixaroo   Follow along on Roo Cloud

Working on reviewing the localization translations for the "xhigh" reasoning effort setting.