Prepare for deployment

[BrayanMQ]

Prepare the application for deployment on Vercel and configure environment variables.

Tasks

1. Create vercel.json if necessary
2. Configure environment variables in Vercel
3. Update README with deployment instructions
4. Verify that build works (npm run build)
5. Configure domain (optional)
6. Configure redirects and rewrites if necessary
7. Test deployment in preview

Acceptance Criteria

• Build works without errors
• Environment variables configured
• README updated
• Successful deployment on Vercel
• App works in production