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

next.config.mjs

@@ -317,17 +317,8 @@ const nextConfig = {
     ];
   },
   images: {
-    remotePatterns: [
-      {
-        protocol: 'https',
-        hostname: 'klz-cables.com',
-        port: '',
-        pathname: '/wp-content/uploads/**',
-      },
-    ],
-    dangerouslyAllowSVG: true,
-    contentDispositionType: 'attachment',
-    contentSecurityPolicy: "default-src 'self'; script-src 'none'; sandbox;",
+    loader: 'custom',
+    loaderFile: './lib/imgproxy-loader.ts',
   },
   async rewrites() {
     const umamiUrl =