feat: add health check page (#244)

backend/routes/health/index.js

@@ -0,0 +1,10 @@
+const express = require('express');
+const router = express.Router();
+
+module.exports = function () {
+  router.get('/', async (req, res) => {
+    res.json({ status: 'ok' });
+  });
+
+  return router;
+};