feat: Add dedicated Azure OpenAI provider using @ai-sdk/azure package (EXT-709)

[roomote]

This PR migrates the Azure OpenAI provider to use the AI SDK's dedicated @ai-sdk/azure package, following the exact pattern established in recent provider migrations (DeepSeek, Groq, Fireworks).

Changes

New Azure Provider (src/api/providers/azure.ts)

• Implements AzureHandler extending BaseProvider
• Uses createAzure from @ai-sdk/azure for native Azure OpenAI support
• Supports streamText and generateText from AI SDK
• Handles tool calls via tool-input-start/delta/end events
• Extracts usage metrics including cache metrics from providerMetadata

Provider Type Registration

• Added "azure" to providerNames in packages/types/src/provider-settings.ts
• Created azureSchema with Azure-specific options:
  • azureApiKey - Azure OpenAI API key
  • azureResourceName - Azure resource name
  • azureDeploymentName - Azure deployment name
  • azureApiVersion - API version (defaults to azureOpenAiDefaultApiVersion)
• Added Azure to providerSettingsSchemaDiscriminated and providerSettingsSchema
• Added modelIdKeysByProvider entry for azure
• Added Azure to MODELS_BY_PROVIDER

Build System

• Added @ai-sdk/azure dependency to src/package.json
• Added AzureHandler export to src/api/providers/index.ts
• Added "azure" case to buildApiHandler in src/api/index.ts

UI Integration

• Added Azure case to useSelectedModel.ts switch statement

Tests (src/api/providers/__tests__/azure.spec.ts)

• Constructor tests
• getModel tests
• Streaming response tests
• Usage metrics tests with cache metrics from providerMetadata
• Tool call handling via tool-input-start/delta/end events
• Error handling tests
• completePrompt tests

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Important

Introduces Azure OpenAI provider using @ai-sdk/azure, updating provider settings, UI integration, and adding tests.

• Azure Provider Implementation:
  • Adds AzureHandler in azure.ts extending BaseProvider for Azure OpenAI support using @ai-sdk/azure.
  • Supports streamText and generateText methods.
  • Handles tool calls and extracts usage metrics.
• Provider Settings:
  • Registers "azure" in providerNames and adds azureSchema in provider-settings.ts.
  • Updates providerSettingsSchemaDiscriminated and providerSettingsSchema for Azure.
  • Adds Azure validation in validate.ts.
• UI and Tests:
  • Integrates Azure provider in useSelectedModel.ts and ApiOptions.tsx.
  • Adds Azure-specific tests in azure.spec.ts.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. The Azure OpenAI provider implementation correctly follows the established AI SDK migration pattern and includes comprehensive test coverage, proper UI integration, and complete validation.

• No bugs or issues identified

Previous reviews

• 25d2476: Review #1
• 774eec5: Review #2
• 774eec5: Review #3
• c6a43cf: Review #4
• 63074dd: Review #5
• 821bec2: Review #6

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

[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The Azure OpenAI provider implementation correctly follows the established AI SDK migration pattern (DeepSeek, Groq, Fireworks). The handler properly integrates with @ai-sdk/azure, includes comprehensive test coverage, and has complete UI integration with translations for all locales.

• No bugs or issues identified

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