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/Input.tsx

@@ -0,0 +1,25 @@
+// Input.tsx
+import React from 'react';
+
+interface InputProps extends React.InputHTMLAttributes<HTMLInputElement> {
+    error?: string;
+}
+
+export const Input = React.forwardRef<HTMLInputElement, InputProps>(
+    ({ className = '', error, ...props }, ref) => {
+        return (
+            <div className="w-full">
+                <input
+                    className={`w-full h-12 bg-zinc-900/50 border border-white/10 rounded-lg px-4 text-white 
+            placeholder-white/40 focus:outline-none focus:ring-2 focus:ring-primary transition-all
+            disabled:opacity-50 disabled:cursor-not-allowed ${error ? 'border-red-500' : ''} ${className}`}
+                    ref={ref}
+                    {...props}
+                />
+                {error && <p className="mt-2 text-sm text-red-400">{error}</p>}
+            </div>
+        );
+    }
+);
+
+Input.displayName = 'Input';