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

frontend/lib/domain/entities/preferences.dart

@@ -5,7 +5,20 @@ part 'preferences.g.dart';
 @freezed
 abstract class Preferences with _$Preferences {
   const factory Preferences({
-    required String test,
+    /// Scores keyed by preference type (e.g. 'sightseeing', 'shopping', 'nature')
+    required Map<String, int> scores,
+
+    /// Maximum trip duration in minutes
+    required int maxTimeMinutes,
+
+    /// Required start location [lat, lon]
+    required List<double> startLocation,
+
+    /// Optional end location
+    List<double>? endLocation,
+
+    /// Optional detour tolerance in minutes
+    int? detourToleranceMinutes,
   }) = _Preferences;
 
   factory Preferences.fromJson(Map<String, Object?> json) => _$PreferencesFromJson(json);