update UI and QOL

server/routes/developers.js

@@ -0,0 +1,24 @@
+const express = require('express');
+const { listDevelopers, addDeveloper, removeDeveloper } = require('../db');
+
+const router = express.Router();
+
+router.get('/', (_req, res) => {
+  res.json(listDevelopers());
+});
+
+router.post('/', (req, res) => {
+  const { name } = req.body;
+  if (!name?.trim()) return res.status(400).json({ error: 'name is required' });
+  const dev = addDeveloper(name.trim());
+  if (!dev) return res.status(409).json({ error: 'Developer already exists' });
+  res.status(201).json(dev);
+});
+
+router.delete('/:id', (req, res) => {
+  const dev = removeDeveloper(req.params.id);
+  if (!dev) return res.status(404).json({ error: 'Not found' });
+  res.status(204).end();
+});
+
+module.exports = router;