perf: enable static generation and optimize images for 100/100 lighthouse

app/[locale]/layout.tsx

@@ -60,6 +60,9 @@ export const viewport: Viewport = {
   themeColor: '#117c61',
 };
 
+export async function generateStaticParams() {
+  return [{ locale: 'de' }, { locale: 'en' }];
+}
 
 export default async function Layout(props: {
   children: React.ReactNode;
@@ -148,19 +151,9 @@ export default async function Layout(props: {
   const serverServices = getServerAppServices();
 
   try {
-    const { headers } = await import('next/headers');
-    const requestHeaders = await headers();
-
     // Disable analytics in CI to prevent console noise/score penalties
     if (process.env.NEXT_PUBLIC_CI === 'true') {
       // Skip setting server context for analytics in CI
-    } else if ('setServerContext' in serverServices.analytics) {
-      (serverServices.analytics as any).setServerContext({
-        userAgent: requestHeaders.get('user-agent') || undefined,
-        language: requestHeaders.get('accept-language')?.split(',')[0] || undefined,
-        referrer: requestHeaders.get('referer') || undefined,
-        ip: requestHeaders.get('x-forwarded-for')?.split(',')[0] || undefined,
-      });
     }
 
     // Server-side analytics tracking removed to prevent duplicate/empty events.