fix: render backend issues

[mr-jones123]

This pull request updates the backend API to support deployment on Render and Vercel, and refactors the frontend chat hook to use a consistent endpoint environment variable. The most significant changes are the addition of a health check endpoint, expanded CORS support for Vercel deployments, and simplification of the chat hook configuration.

Backend API improvements:

• Added a health check endpoint (GET /) to src/api/main.py for Render deployment monitoring.
• Expanded CORS allow_origins to include all Vercel preview deployments (https://*.vercel.app) in src/api/main.py.

Frontend chat hook refactor:

• Refactored useStreamingChat in src/hooks/useStreamingChat.ts to use NEXT_PUBLIC_RENDER_ENDPOINT as the default endpoint, falling back to http://localhost:8000. Removed the apiUrl parameter to simplify usage.
• Updated all internal references in useStreamingChat to use the new endpoint variable instead of the previous apiUrl parameter. [1] [2]

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
xai-research	Ready	Preview	Comment	Nov 1, 2025 8:21am
xai-research-4tm2	Ready	Preview	Comment	Nov 1, 2025 8:21am