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

Dockerfile

@@ -5,6 +5,7 @@ WORKDIR /app
 # Arguments for build-time configuration
 ARG NEXT_PUBLIC_BASE_URL
 ARG NEXT_PUBLIC_TARGET
+ARG NEXT_PUBLIC_IMGPROXY_URL
 ARG DIRECTUS_URL
 ARG UMAMI_WEBSITE_ID
 ARG UMAMI_API_ENDPOINT
@@ -13,6 +14,7 @@ ARG NPM_TOKEN
 # Environment variables for Next.js build
 ENV NEXT_PUBLIC_BASE_URL=$NEXT_PUBLIC_BASE_URL
 ENV NEXT_PUBLIC_TARGET=$NEXT_PUBLIC_TARGET
+ENV NEXT_PUBLIC_IMGPROXY_URL=$NEXT_PUBLIC_IMGPROXY_URL
 ENV DIRECTUS_URL=$DIRECTUS_URL
 ENV UMAMI_WEBSITE_ID=$UMAMI_WEBSITE_ID
 ENV UMAMI_API_ENDPOINT=$UMAMI_API_ENDPOINT