init: Node starter (podman dev + Coolify deploy, Claude agent 골격)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

scripts/check-db.js

@@ -0,0 +1,11 @@
+// DB 연결 빠른 확인: `npm run db:check`
+import { pingDb, pool } from "../src/db.js";
+
+try {
+  console.log("DB OK:", await pingDb());
+} catch (e) {
+  console.error("DB FAIL:", e.message);
+  process.exitCode = 1;
+} finally {
+  await pool.end();
+}