chore: align infrastructure with server

scripts/list_users.cjs

@@ -0,0 +1,10 @@
+const { Pool } = require('pg');
+
+async function run() {
+  const pool = new Pool({ connectionString: 'postgresql://postgres:postgres@localhost:5432/xflow' });
+  const res = await pool.query('SELECT id, username, email, role FROM "User"');
+  console.log(JSON.stringify(res.rows, null, 2));
+  await pool.end();
+}
+
+run().catch(console.error);