feat(wip): Update entities and adopt a proper repository workflow for trip "obtention"

frontend/lib/data/models/landmark_model.dart

@@ -1,3 +1,4 @@
+// TODO - I have the feeling this file is outdated and not used anymore
 import 'package:anyway/domain/entities/landmark.dart';
 import 'package:anyway/domain/entities/landmark_description.dart';
 import 'package:anyway/domain/entities/landmark_type.dart';
@@ -16,6 +17,8 @@ abstract class LandmarkModel with _$LandmarkModel {
     required String description,
   }) = _LandmarkModel;
 
+  const LandmarkModel._();
+
   factory LandmarkModel.fromJson(Map<String, dynamic> json) => _$LandmarkModelFromJson(json);
 
   Landmark toEntity() => Landmark(
@@ -24,7 +27,6 @@ abstract class LandmarkModel with _$LandmarkModel {
     location: location,
     type: LandmarkType(type: LandmarkTypeEnum.values.firstWhere((e) => e.value == type)),
     isSecondary: isSecondary,
-    // TODO - try to set tags
-    description: LandmarkDescription(description: description, tags: [])
+    description: LandmarkDescription(description: description, tags: []),
   );
 }