feat: Introduce runtime configuration for domain and enhance S3 storage settings with public base URL and Contabo support.

src/app/api/config/route.ts

@@ -0,0 +1,7 @@
+import { NextResponse } from 'next/server';
+
+export async function GET() {
+  return NextResponse.json({
+    domain: process.env.NEXT_PUBLIC_NODE_DOMAIN || process.env.NODE_DOMAIN || 'localhost:3000',
+  });
+}