chore(wip): upgrade dependencies, begin refactor

frontend/lib/domain/entities/landmark.dart

@@ -0,0 +1,21 @@
+import 'package:anyway/domain/entities/landmark_type.dart';
+import 'package:anyway/domain/entities/landmark_description.dart';
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+part 'landmark.freezed.dart';
+part 'landmark.g.dart';
+
+@unfreezed
+abstract class Landmark with _$Landmark {
+  factory Landmark({
+    required String uuid,
+    required String name,
+    required List<double> location,
+    required LandmarkType type,
+    required bool isSecondary,
+
+    required LandmarkDescription description,
+  }) = _Landmark;
+
+  factory Landmark.fromJson(Map<String, Object?> json) => _$LandmarkFromJson(json);
+}