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

frontend/lib/domain/entities/landmark.dart

@@ -12,9 +12,38 @@ abstract class Landmark with _$Landmark {
     required String name,
     required List<double> location,
     required LandmarkType type,
-    required bool isSecondary,
 
-    required LandmarkDescription description,
+    @JsonKey(name: 'is_secondary')
+    bool? isSecondary,
+
+    /// Optional rich description object (may be null if API returns plain string)
+    LandmarkDescription? description,
+
+    @JsonKey(name: 'name_en')
+    String? nameEn,
+
+    @JsonKey(name: 'website_url')
+    String? websiteUrl,
+
+    @JsonKey(name: 'image_url')
+    String? imageUrl,
+
+    @JsonKey(name: 'attractiveness')
+    int? attractiveness,
+
+    @JsonKey(name: 'n_tags')
+    int? tagCount,
+
+
+
+    /// Duration at landmark in minutes
+    @JsonKey(name: 'duration')
+    int? durationMinutes,
+
+    bool? visited,
+
+    @JsonKey(name: 'time_to_reach_next')
+    int? timeToReachNextMinutes,
   }) = _Landmark;
 
   factory Landmark.fromJson(Map<String, Object?> json) => _$LandmarkFromJson(json);