chore: migrate to payload / nextjs

src/app/(frontend)/[[...slug]]/page.tsx

@@ -0,0 +1,12 @@
+import NextApp from '@/spa/NextApp'
+
+type Args = {
+  params: Promise<{ slug?: string[] }>
+}
+
+export default async function Page({ params }: Args) {
+  const { slug = [] } = await params
+  const pathname = `/${slug.join('/')}`.replace(/\/$/, '') || '/'
+
+  return <NextApp pathname={pathname} />
+}