Replace GitHub Pages pipeline with Vercel CI/CD for dynamic Next.js deployment

[Copilot]

This app was configured to deploy via GitHub Pages static artifacts, but it uses dynamic App Router routes and API handlers. The PR realigns CI/CD with a server-capable deployment target (Vercel) and documents the required runtime configuration.

• Deployment pipeline rewrite

  • Replaced the Pages-oriented workflow with a Next.js/Vercel pipeline in .github/workflows/nextjs.yml.
  • build job now runs install + lint + Next build on pushes/PRs.
  • deploy job runs only on main and deploys via Vercel CLI (pull → build --prod → deploy --prebuilt --prod).

• Fail-fast secret validation

  • Added an explicit guard step in deploy to stop early with clear errors when required Vercel secrets are missing:
    • VERCEL_TOKEN
    • VERCEL_ORG_ID
    • VERCEL_PROJECT_ID

• Docs updated for operational setup

  • README deployment section now reflects GitHub Actions + Vercel flow.
  • Clarified separation between GitHub repository secrets and Vercel project environment variables (NEXT_PUBLIC_BASE_URL).

deploy:
  if: github.event_name != 'pull_request' && github.ref == 'refs/heads/main'
  steps:
    - name: Validate Vercel secrets
      run: |
        test -n "$VERCEL_TOKEN" || (echo "Missing required secret: VERCEL_TOKEN" && exit 1)
        test -n "$VERCEL_ORG_ID" || (echo "Missing required secret: VERCEL_ORG_ID" && exit 1)
        test -n "$VERCEL_PROJECT_ID" || (echo "Missing required secret: VERCEL_PROJECT_ID" && exit 1)

• screenshot
  • https://github.com/user-attachments/assets/37068220-2ae4-4684-bea8-e4a199b88d5b

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