Enhance CarModifications component by integrating API calls for fetching modifications and customers, implementing a dialog for adding modifications to customers, and improving error and success message handling. Refactor state management and UI elements for better user experience.

routes/modifications.js

@@ -0,0 +1,27 @@
+const express = require('express');
+const router = express.Router();
+const Modification = require('../models/Modification');
+const auth = require('../middleware/auth');
+
+// Get all modifications
+router.get('/', async (req, res) => {
+  try {
+    const modifications = await Modification.find().sort({ name: 1 });
+    res.json(modifications);
+  } catch (err) {
+    res.status(500).json({ message: err.message });
+  }
+});
+
+// Add a new modification (admin only, or for seeding)
+router.post('/', auth, async (req, res) => {
+  try {
+    const mod = new Modification(req.body);
+    await mod.save();
+    res.status(201).json(mod);
+  } catch (err) {
+    res.status(400).json({ message: err.message });
+  }
+});
+
+module.exports = router;