QC-62: Vercel project + env vars checklist

[DarshanCode2005]

Summary

Vercel project + env vars checklist

Milestone: M8 Deploy
Labels: devops

Learn

• Vercel env var scopes
• Preview vs Production

Build

• Document all env vars for Vercel dashboard
• Add vercel.json if needed
• Note: no custom Socket.io server

Files

• docs/DEPLOYMENT.md

Acceptance criteria

• Checklist covers Pusher, OpenAI, Stripe, MongoDB, NextAuth

Depends on

• QC-05: Install dependencies and verify dev server #6 (QC-05)