Add sound page

lib/api/api_service.dart

@@ -1,6 +1,8 @@
 import 'package:stelaris/api/api_client.dart';
 import 'package:stelaris/api/base_api.dart';
+import 'package:stelaris/api/service/client/sound_client_api.dart';
 import 'package:stelaris/api/client_api.dart';
+import 'package:stelaris/api/model/sound/sound_event_model.dart';
 import 'package:stelaris/api/model/attribute_model.dart';
 import 'package:stelaris/api/model/notification_model.dart';
 import 'package:stelaris/api/service/font_api.dart';
@@ -40,6 +42,10 @@ class ApiService {
     toJson: (model) => model.toJson(),
   );
 
+  late final ClientAPI<SoundEventModel> soundApi = SoundClientApi(
+    apiClient: _apiClient,
+  );
+
   /// Creates an instance of [ApiClient] with the backend URL.
   ApiClient _createApiClient() => ApiClient(Environment.backendURl);
 

lib/api/model/sound/sound_event_model.dart

@@ -0,0 +1,42 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:stelaris/api/model/data_model.dart';
+import 'package:stelaris/api/model/sound/sound_file_source.dart';
+import 'package:stelaris/api/paginated_result.dart';
+
+part 'sound_event_model.freezed.dart';
+
+part 'sound_event_model.g.dart';
+
+SoundEventModel soundEventFromJson(dynamic json) =>
+    SoundEventModel.fromJson(json);
+
+Map<String, dynamic> soundEventToJson(SoundEventModel model) => model.toJson();
+
+@freezed
+abstract class SoundEventModel with _$SoundEventModel, DataModel {
+  const SoundEventModel._();
+
+  // Define the specific const default directly within the class that uses it.
+  // This is well-encapsulated.
+  static const PaginatedResult<SoundFileSource> _defaultFiles = PaginatedResult(
+    items: <SoundFileSource>[],
+    totalItems: 0,
+    totalPages: 0,
+    currentPage: 1,
+    pageSize: 0,
+  );
+
+  factory SoundEventModel({
+    required String uiName,
+    String? id,
+    String? variableName,
+    String? keyName,
+    String? subTitle,
+    @Default(SoundEventModel._defaultFiles)
+    PaginatedResult<SoundFileSource> files,
+    @Default(false) @JsonKey(includeToJson: false) bool isLoading,
+  }) = _SoundEventModel;
+
+  factory SoundEventModel.fromJson(Map<String, dynamic> json) =>
+      _$SoundEventModelFromJson(json);
+}