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/components-vite/Label.tsx

@@ -0,0 +1,15 @@
+// Label.tsx
+import React from 'react';
+
+interface LabelProps extends React.LabelHTMLAttributes<HTMLLabelElement> {
+    required?: boolean;
+}
+
+export const Label: React.FC<LabelProps> = ({ children, required, className = '', ...props }) => {
+    return (
+        <label className={`block text-sm font-medium text-white/80 mb-2 ${className}`} {...props}>
+            {children}
+            {required && <span className="text-red-400 ml-1">*</span>}
+        </label>
+    );
+};