fix: skip prompt_cache_retention parameter for Azure endpoints

[roomote]

Related GitHub Issue

Closes: #10782

Description

This PR attempts to address Issue #10782 by fixing Azure Foundry compatibility with the OpenAI Native handler.

Azure Foundry/AI does not support the prompt_cache_retention parameter that OpenAI's API accepts. When users configure the OpenAI Native handler with an Azure Foundry endpoint (e.g., *.openai.azure.com or *.services.ai.azure.com), API calls would fail because Azure rejects this unsupported parameter.

Implementation Details:

• Added isAzureEndpoint() helper method to detect Azure base URLs
• Modified getPromptCacheRetention() to return undefined for Azure endpoints, effectively skipping the parameter in API requests
• Handles common Azure URL patterns: *.azure.com and *.azure-api.net

Test Procedure

• Added 5 new unit tests to verify the Azure endpoint detection:
  • Azure .azure.com endpoints skip prompt_cache_retention
  • Azure AI Foundry *.services.ai.azure.com endpoints skip prompt_cache_retention
  • Azure API Management *.azure-api.net endpoints skip prompt_cache_retention
  • Non-Azure endpoints still include prompt_cache_retention for eligible models
  • Default OpenAI endpoints (no base URL configured) include prompt_cache_retention

To run tests: cd src && npx vitest run api/providers/__tests__/openai-native-usage.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

• No documentation updates are required.

Additional Notes

Feedback and guidance are welcome! This is an attempt to help users who are locked to Azure Foundry endpoints in their work tenants.

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Important

Fixes Azure endpoint compatibility by skipping unsupported prompt_cache_retention parameter in OpenAiNativeHandler.

• Behavior:
  • getPromptCacheRetention() in openai-native.ts now returns undefined for Azure endpoints, skipping prompt_cache_retention in requests.
  • isAzureEndpoint() added to detect Azure URLs (*.azure.com, *.azure-api.net).
• Tests:
  • Added 5 unit tests in openai-native-usage.spec.ts to verify Azure endpoint detection and parameter omission.
  • Tests cover Azure .azure.com, *.services.ai.azure.com, and *.azure-api.net endpoints, as well as non-Azure and default OpenAI endpoints.

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Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The implementation correctly detects Azure endpoints and skips the unsupported prompt_cache_retention parameter. The Azure detection logic handles edge cases properly (invalid URLs, case sensitivity) and is consistent with existing Azure patterns in the codebase. Test coverage is comprehensive.

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