feat: Refactor code structure and optimize performance across multiple modules

mobile-apps/staff-app/lib/features/profile/schedule/data/models/day_schedule_model.dart

@@ -0,0 +1,13 @@
+import 'package:krow/features/profile/schedule/data/models/schedule_slot_model.dart';
+
+class DayScheduleModel {
+  DayScheduleModel({
+    required this.date,
+    required this.slots,
+    this.isWeekly = false,
+  });
+
+  final DateTime date;
+  final bool isWeekly;
+  List<ScheduleSlotModel> slots;
+}

mobile-apps/staff-app/lib/features/profile/schedule/data/models/schedule_slot_model.dart

@@ -0,0 +1,38 @@
+import 'package:krow/core/application/common/date_time_extension.dart';
+
+class ScheduleSlotModel {
+  ScheduleSlotModel({
+    required this.isWeekly,
+    required this.startAt,
+    required this.endAt,
+    this.id,
+  });
+
+  factory ScheduleSlotModel.fromJson(Map<String, dynamic> data) {
+    return ScheduleSlotModel(
+      id: data['id'] as String?,
+      isWeekly: data['type'] == 'weekly',
+      startAt: DateTime.parse(data['start_at'] as String),
+      endAt: DateTime.parse(data['end_at'] as String),
+    );
+  }
+
+  final String? id;
+  final bool isWeekly;
+  final DateTime startAt;
+  final DateTime endAt;
+
+  // TODO(Sleep): For now has to use .replaceAll('.000', '') for trim DateTime otherwise will result in error from backend.
+  Map<String, dynamic> toJson() {
+    return {
+      // if (id != null) 'id': id,
+      'type': isWeekly ? 'weekly' : 'range',
+      'start_at': startAt.toString().replaceAll('.000', ''),
+      'end_at': endAt.toString().replaceAll('.000', ''),
+      'day_of_week': startAt.getWeekdayId(),
+    };
+  }
+
+  String getIdKey() =>
+      isWeekly ? startAt.getWeekdayId() : startAt.getDayDateId();
+}