feat: Refactor code structure and optimize performance across multiple modules

mobile-apps/staff-app/lib/features/shifts/data/models/event.dart

@@ -0,0 +1,64 @@
+import 'package:json_annotation/json_annotation.dart';
+import 'package:krow/features/shifts/data/models/event_tag.dart';
+
+part 'event.g.dart';
+
+@JsonSerializable(fieldRename: FieldRename.snake)
+class Event {
+  String? id;
+  Business? business;
+  String? name;
+  String? date;
+  String? additionalInfo;
+  List<Addon>? addons;
+  List<EventTag>? tags;
+
+
+  Event({
+    this.business,
+    this.name,
+    this.date,
+    this.additionalInfo,
+    this.addons,
+    this.tags,
+  });
+
+  factory Event.fromJson(Map<String, dynamic> json) {
+    return _$EventFromJson(json);
+  }
+
+  Map<String, dynamic> toJson() => _$EventToJson(this);
+}
+
+@JsonSerializable(fieldRename: FieldRename.snake)
+class Business {
+  String? name;
+  String? avatar;
+
+  Business({this.name, this.avatar});
+
+  factory Business.fromJson(Map<String, dynamic> json) {
+    return _$BusinessFromJson(json);
+  }
+
+  Map<String, dynamic> toJson() => _$BusinessToJson(this);
+}
+
+@JsonSerializable(fieldRename: FieldRename.snake)
+class Addon {
+  String? name;
+
+  Addon({this.name});
+
+  factory Addon.fromJson(Map<String, dynamic> json) {
+    return Addon(
+      name: json['name'],
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'name': name,
+    };
+  }
+}