Refactored API into seperate chunks

api/routes/ranks.js

@@ -0,0 +1,10 @@
+const express = require('express');
+const router = express.Router();
+
+// Placeholder router for rank-related routes.
+// Implement rank endpoints here, for example:
+// router.get('/', async (req, res) => { /* ... */ });
+// router.post('/change', async (req, res) => { /* ... */ });
+
+module.exports = router;
+