Add functionality to fetch devices by room ID

Added a new method in DevicesCubit to fetch devices by room ID and updated
related classes and API calls to support this functionality.

lib/features/devices/model/room_model.dart

@@ -1,30 +1,37 @@
 import 'package:syncrow_app/features/devices/model/device_category_model.dart';
+import 'package:syncrow_app/features/devices/model/device_model.dart';
 
 class RoomModel {
   final int? id;
   final String? name;
 
-  final List<DevicesCategoryModel>? categories;
+  List<DeviceModel>? devices;
 
   RoomModel({
     required this.id,
     required this.name,
-    required this.categories,
+    required this.devices,
   });
 
   Map<String, dynamic> toJson() {
     return {
       'id': id,
       'name': name,
-      'devices': categories,
+      'devices': devices,
     };
   }
 
   factory RoomModel.fromJson(Map<String, dynamic> json) {
+    List<DeviceModel> devices = [];
+    if (json['devices'] != null) {
+      for (var device in json['devices']) {
+        devices.add(DeviceModel.fromJson(device));
+      }
+    }
     return RoomModel(
       id: json['roomId'],
       name: json['roomName'],
-      categories: json['devices'],
+      devices: devices,
     );
   }
 }