Add board service and repository, update routes and assets

- Introduced BoardService and BoardRepository for managing board-related data.
- Updated app routes to reflect the new board screen structure.
- Added new board-related assets to the asset manager.
- Refactored BoardScreen navigation to utilize the new provider structure.

lib/data/services/model/board_response/board_response.dart

@@ -0,0 +1,34 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+import '../error/error_model.dart';
+
+part 'board_response.freezed.dart';
+part 'board_response.g.dart';
+
+@freezed
+abstract class BoardResponse with _$BoardResponse {
+  const factory BoardResponse({
+    required bool? success,
+    required String? message,
+    required List<BoardData>? data,
+    required ErrorModel? error,
+  }) = _BoardResponse;
+
+  factory BoardResponse.fromJson(Map<String, Object?> json) =>
+      _$BoardResponseFromJson(json);
+}
+
+@freezed
+abstract class BoardData with _$BoardData {
+  const factory BoardData({
+    required String? id,
+    required String? description,
+    required DateTime? deadline,
+    required String? assignedTo,
+    required bool? isReady,
+    required String? status,
+  }) = _BoardData;
+
+  factory BoardData.fromJson(Map<String, Object?> json) =>
+      _$BoardDataFromJson(json);
+}