feat: add admin user management (create, password change)

app/admin/users/page.tsx

@@ -0,0 +1,13 @@
+import React from 'react';
+import { prisma } from '@/app/lib/prisma';
+import UserManager from './UserManager';
+
+export const dynamic = 'force-dynamic';
+
+export default async function AdminUsersPage() {
+  const users = await prisma.user.findMany({
+    orderBy: { createdAt: 'desc' }
+  });
+
+  return <UserManager users={users} />;
+}