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

scripts/pagespeed-sitemap.ts

@@ -86,7 +86,7 @@ async function main() {
 
     // Using a more robust way to execute and capture output
     // We remove 'npx lhci upload' to keep everything local and avoid Google-hosted reports
-    const lhciCommand = `npx lhci collect ${urlArgs} ${chromePathArg} --collect.settings.chromeFlags='--no-sandbox --disable-setuid-sandbox' --collect.settings.extraHeaders='${extraHeaders}' && npx lhci assert`;
+    const lhciCommand = `npx lhci collect ${urlArgs} ${chromePathArg} --config=config/lighthouserc.json --collect.settings.extraHeaders='${extraHeaders}' && npx lhci assert --config=config/lighthouserc.json`;
 
     console.log(`💻 Executing LHCI...`);