feat: optimize performance and SEO, integrate Lighthouse CI

- Integrated imgproxy for centralized image optimization
- Implemented Lighthouse CI in Gitea pipeline with native Chromium
- Reached 100/100 SEO score by fixing canonicals, hreflang, and link text
- Optimized LCP by forcing Hero component visibility until hydration
- Decoupled analytics into an async shell to reduce TTI

.gitignore

@@ -2,6 +2,11 @@ node_modules
 .next
 .DS_Store
 
+# Lighthouse CI
+.lighthouseci/
+lighthouserc.cjs
+.lighthouserc.json
+
 # Directus
 directus/uploads
 !directus/extensions/