feat: Add Lighthouse CI workflow for performance testing

- Add GitHub Actions workflow for automated Lighthouse audits
- Configure Lighthouse CI with performance, accessibility, SEO, and best practices checks
- Add lighthouse npm script for local testing
- Update dependencies with @lhci/cli and lighthouse packages
- Configure .gitignore to exclude lighthouse reports
- Update README with testing information

The workflow runs on:
- Pull requests to master
- Pushes to master and lighthouse-ci-only branch
- Manual workflow dispatch

Lighthouse thresholds:
- Performance: 60% (warn)
- Accessibility: 80% (warn)
- Best Practices: 70% (warn)
- SEO: 70% (warn)

Author: Recxsmacx

.github/workflows/lighthouse-ci.yml

@@ -8,6 +8,10 @@
 # testing
 /coverage
 
+# lighthouse
+/.lighthouseci
+/lighthouse-reports
+
 # next.js
 /.next/
 /out/

.gitignore

@@ -36,6 +36,12 @@ You can start editing the page by modifying `pages/index.js`. The page auto-upda
 
 The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
 
+## Testing
+
+This project includes automated testing:
+- **Cypress**: End-to-end testing (`npm run cy:run`)
+- **Lighthouse**: Performance, accessibility, and SEO auditing (runs automatically in CI)
+
 ## AsyncAPI Contributors ✨
 
 Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):

README.md

@@ -13,6 +13,8 @@
     "generate:assets": "echo \"No assets to configure\"",
     "test": "echo \"No tests configured yet\"",
     "cy:open": "cypress open",
+    "cy:run": "cypress run",
+    "lighthouse": "lhci autorun",
     "release": "echo \"No release to npm for this project\""
   },
   "dependencies": {
@@ -32,12 +34,14 @@
     "react-slick": "^0.29.0"
   },
   "devDependencies": {
+    "@lhci/cli": "^0.13.0",
     "@types/nodemailer": "^6.4.17",
     "@types/react-slick": "^0.23.13",
     "autoprefixer": "^10.4.7",
     "cypress": "^13.11.0",
     "eslint": "8.15.0",
     "eslint-config-next": "13.1.1",
+    "lighthouse": "^11.4.0",
     "postcss": "^8.4.31",
     "prettier": "^3.5.3",
     "tailwindcss": "^3.0.24",