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

components/analytics/AnalyticsShell.tsx

@@ -0,0 +1,20 @@
+'use client';
+
+import dynamic from 'next/dynamic';
+import { Suspense } from 'react';
+
+const DynamicAnalyticsProvider = dynamic(() => import('./AnalyticsProvider'), {
+  ssr: false,
+});
+const DynamicScrollDepthTracker = dynamic(() => import('./ScrollDepthTracker'), {
+  ssr: false,
+});
+
+export default function AnalyticsShell() {
+  return (
+    <Suspense fallback={null}>
+      <DynamicAnalyticsProvider />
+      <DynamicScrollDepthTracker />
+    </Suspense>
+  );
+}