Add Azure Provider

[Kludex]

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commit:	1fcc690
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[hyperlint-ai-deprecated]

PR Change Summary

Added support for Azure as a provider in the API documentation.

• Introduced AzureProvider class for Azure AI Foundry integration
• Updated models documentation with usage example for AzureProvider
• Modified providers documentation to include Azure as a new provider

Modified Files

• docs/api/providers.md
• docs/models.md

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