chore: align infrastructure with server

scripts/create_db.cjs

@@ -0,0 +1,13 @@
+const { Pool } = require('pg');
+async function test() {
+  try {
+    const pool = new Pool({ connectionString: `postgresql://postgres:postgres@localhost:5432/postgres` });
+    await pool.query('CREATE DATABASE "xflow"');
+    console.log('✅ SUCCESS created xflow');
+    process.exit(0);
+  } catch(e) {
+    console.log('❌ failed:', e.message);
+    process.exit(1);
+  }
+}
+test();