## DOCUMENTATION: Frontend Deployment Guide

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Description
There is no guide explaining how to build and deploy the Next.js frontend to production. Contributors and maintainers have no reference for environment setup, build commands, or hosting configuration.

Tasks

• Create apps/web/DEPLOYMENT.md.
• Document required environment variables (with descriptions, not values).
• Cover: npm run build, npm run start, Vercel deployment steps, and custom domain setup.
• Add a section on preview deployments for PRs.
  Acceptance Criteria
• A new maintainer can deploy the app to Vercel following only this guide.
• All required env vars are listed with descriptions.