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.

models/Modification.js

@@ -0,0 +1,14 @@
+const mongoose = require('mongoose');
+
+const modificationSchema = new mongoose.Schema({
+  name: { type: String, required: true },
+  description: { type: String, required: true },
+  price: { type: Number, required: true },
+  category: { type: String, required: true },
+  icon: { type: String }, // optional: path to SVG/icon
+  createdAt: { type: Date, default: Date.now }
+});
+
+const Modification = mongoose.model('Modification', modificationSchema);
+
+module.exports = Modification;