feat: Refactor code structure and optimize performance across multiple modules

mobile-apps/staff-app/lib/features/profile/faq/data/models/faq_entry_model.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/foundation.dart';
+
+@immutable
+class FaqEntryModel {
+  const FaqEntryModel({required this.question, required this.answer});
+
+  factory FaqEntryModel.fromJson(Map<String, dynamic> json) {
+    //TODO: Add from JSON conversion once the backend is ready.
+    throw UnimplementedError('Implement from JSON conversion');
+  }
+
+  final String question;
+  final String answer;
+}