Complete Phase 4: Polish, Docker, CI/CD, and deployment readiness

- Fix responsive issues: Card/detail panel use p-4 md:p-8, larger
  progress dots, tighter mobile gaps in Contact section
- Fix lint errors: remove unused vars in BentoCard, AnimatedSection;
  fix explicit-any in ExpandableServiceCard test
- Fix zod-validation-error v4 dependency for eslint-plugin-react-hooks
- Add type-check script to package.json
- Create multi-stage Dockerfile (node:20-alpine build, nginx:alpine serve)
- Create .dockerignore to exclude dev files from build context
- Create nginx.conf with SPA routing, gzip, caching, security headers
- Update docker-compose.yml: build context replaces volume mount,
  preserve Traefik labels, add healthcheck
- Rewrite CI/CD pipeline: Node.js setup, npm ci, type-check, lint,
  test, build, rsync + docker compose build on server
- Add AI-generated images for all placeholder locations
- Archive original index.html as index.html.original

All checks pass: tsc --noEmit, eslint, 222/222 tests, vite build

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -22,3 +22,7 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
+
+# Original site backup
+index.html.original
+index.html.backup*