feat(setup): add initial setup wizard for admin account and SMTP configuration

shop/app/setup/page.tsx

@@ -0,0 +1,15 @@
+import { isSetupNeeded } from '@/lib/actions/setup'
+import { redirect } from 'next/navigation'
+import { SetupWizard } from '@/components/SetupWizard'
+
+export const dynamic = 'force-dynamic'
+
+export default async function SetupPage() {
+  const needed = await isSetupNeeded()
+
+  if (!needed) {
+    redirect('/')
+  }
+
+  return <SetupWizard />
+}