Restore removed files

inventory-server/dashboard/aircall-server/src/utils/db.js

@@ -0,0 +1,15 @@
+import { MongoClient } from 'mongodb';
+
+const MONGODB_URI = process.env.MONGODB_URI || 'mongodb://localhost:27017/dashboard';
+const DB_NAME = process.env.MONGODB_DB || 'dashboard';
+
+export async function connectMongoDB() {
+  try {
+    const client = await MongoClient.connect(MONGODB_URI);
+    console.log('Connected to MongoDB');
+    return client.db(DB_NAME);
+  } catch (error) {
+    console.error('MongoDB connection error:', error);
+    throw error;
+  }
+}