feat: open-source template refactor

- Extract content to src/config/profile.js (single-file customization)
- Add Apache-2.0 LICENSE, CONTRIBUTING.md, robots.txt
- Add GitHub Pages auto-deploy workflow
- Update package.json: private=false, license, homepage
- Add SEO/Open Graph meta tags to index.html
- Rewrite README.md with Quick Start guide
- Update .gitignore: AI tooling, caches, deployment state

.gitignore

@@ -54,3 +54,16 @@ package-backup.json
 package-modern.json
 package-updated-conservative.json
 package-vue2-working.json
+
+# Tooling (Hermes / OpenCode)
+.hermes/
+NUL
+
+# Generic caches
+.cache/
+.temp/
+.tmp/
+
+# Deployment platform state (uncomment if used)
+# .netlify/
+# .vercel/