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/app/layout.tsx

@@ -0,0 +1,19 @@
+import type { Metadata } from 'next';
+import './globals.css';
+
+export const metadata: Metadata = {
+  title: {
+    template: '%s | Damjan Savic',
+    default: 'Damjan Savic | AI & Automation Specialist',
+  },
+  description: 'AI & Automation Specialist - Building AI agents and automation solutions.',
+  metadataBase: new URL(process.env.NEXT_PUBLIC_SITE_URL || 'https://damjan-savic.com'),
+};
+
+export default function RootLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return children;
+}