Initial commit: Portfolio Website

Vollständige Next.js 15 Portfolio-Website mit:
- Blog-System mit 100+ Artikeln
- Supabase-Integration
- Responsive Design mit Tailwind CSS
- TypeScript-Konfiguration
- Testing-Setup mit Vitest und Playwright

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/not-found.tsx

@@ -0,0 +1,25 @@
+import Link from 'next/link';
+import { getTranslations } from 'next-intl/server';
+import { defaultLocale } from '@/i18n/config';
+
+export default async function NotFound() {
+  const t = await getTranslations('pages.notfound');
+
+  return (
+    <div className="bg-zinc-900 text-zinc-50 min-h-screen flex items-center justify-center">
+      <div className="text-center px-4">
+        <h1 className="text-6xl font-bold mb-4">404</h1>
+        <h2 className="text-2xl font-semibold mb-4">{t('title')}</h2>
+        <p className="text-zinc-400 mb-8">
+          {t('description')}
+        </p>
+        <Link
+          href={`/${defaultLocale}`}
+          className="px-6 py-3 bg-white text-zinc-900 hover:bg-zinc-200 rounded-lg transition-colors inline-block font-medium"
+        >
+          {t('backHome')}
+        </Link>
+      </div>
+    </div>
+  );
+}