refactor(infra): directory structure (#4615)

packages/backend/storage/index.js

@@ -0,0 +1,11 @@
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+
+/** @type {import('.')} */
+const binding = require('./storage.node');
+
+export const Storage = binding.Storage;
+export const mergeUpdatesInApplyWay = binding.mergeUpdatesInApplyWay;
+export const verifyChallengeResponse = binding.verifyChallengeResponse;
+export const mintChallengeResponse = binding.mintChallengeResponse;