fix: Remove Azure OpenAI provider support

[edwinjosechittilappilly]

This removes Azure OpenAI as a first-class provider across the frontend and backend: settings/onboarding UI, provider model queries, API routes, validation paths, config models, and provider health/registry wiring. It also deletes Azure OpenAI-specific components/helpers and environment/config handling.

In parallel, Azure AI Foundry syncing to Langflow was tightened to handle OpenAI-compatible /openai/v1 endpoints correctly by avoiding dated API version propagation for that endpoint form.

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React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit 448537f.}