Migrate from Vite to Next.js 15 with SSR

- Replace Vite + React Router with Next.js 15 App Router
- Implement i18n with next-intl (URL-based: /de, /en, /sr)
- Add SSR/SSG for all pages (48 static pages generated)
- Setup Supabase SSR client for auth
- Migrate all pages: Home, About, Portfolio, Blog, Contact, Login, Dashboard, Imprint, Privacy, Terms
- Add Docker support with standalone output
- Replace i18next with next-intl JSON translations
- Use next/image for optimized images

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

src/i18n/locales-old/de/cookiebanner.ts

@@ -0,0 +1,14 @@
+const cookiebanner = {
+    cookies: {
+        message: "Diese Website verwendet Cookies, um Ihr Browsing-Erlebnis zu verbessern. Die Daten werden nicht an Dritte weitergegeben.",
+        accept: "Cookies akzeptieren",
+        decline: "Ablehnen",
+        necessary: "Notwendige Cookies",
+        necessaryDesc: "Für grundlegende Funktionen der Website",
+        analytics: "Analyse-Cookies",
+        analyticsDesc: "Für Analysen zur Verbesserung der Website",
+        learnMore: "Mehr erfahren"
+    }
+};
+
+export default cookiebanner;