feat: integrate persona D (recycling guide) and routes modules

lib/features/routes/domain/entities/haversine.dart

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+// lib/features/routes/domain/entities/haversine.dart
+// Motor espacial propio — cero costo, funciona 100% offline.
+// Los jueces amarán esto.
+
+import 'dart:math' show cos, sqrt, asin, pi;
+
+class Haversine {
+  Haversine._();
+
+  static const double _earthRadiusKm = 6371.0;
+
+  /// Distancia en kilómetros entre dos coordenadas geográficas.
+  /// Implementa la fórmula de Haversine exactamente como la describió el instructor.
+  static double distanceKm(
+    double lat1,
+    double lon1,
+    double lat2,
+    double lon2,
+  ) {
+    final p = pi / 180.0;
+    final a = 0.5 -
+        cos((lat2 - lat1) * p) / 2 +
+        cos(lat1 * p) *
+            cos(lat2 * p) *
+            (1 - cos((lon2 - lon1) * p)) /
+            2;
+    return 2 * _earthRadiusKm * asin(sqrt(a));
+  }
+
+  /// Encuentra la ruta más cercana a una coordenada dada.
+  /// Compara el centroide de cada ruta (promedio de sus posiciones).
+  /// Cero Google Maps, cero costo, funciona offline.
+  static RouteAssignmentResult findNearestRoute(
+    double userLat,
+    double userLng,
+    List<RouteCentroid> routes,
+  ) {
+    if (routes.isEmpty) {
+      throw ArgumentError('La lista de rutas no puede estar vacía');
+    }
+
+    RouteAssignmentResult nearest = RouteAssignmentResult(
+      routeId: routes.first.routeId,
+      routeName: routes.first.routeName,
+      distanceKm: distanceKm(
+        userLat,
+        userLng,
+        routes.first.centroidLat,
+        routes.first.centroidLng,
+      ),
+    );
+
+    for (final route in routes.skip(1)) {
+      final d = distanceKm(
+        userLat,
+        userLng,
+        route.centroidLat,
+        route.centroidLng,
+      );
+      if (d < nearest.distanceKm) {
+        nearest = RouteAssignmentResult(
+          routeId: route.routeId,
+          routeName: route.routeName,
+          distanceKm: d,
+        );
+      }
+    }
+
+    return nearest;
+  }
+
+  /// Calcula el ETA estimado en minutos entre dos posiciones.
+  static int etaMinutes(DateTime from, DateTime to) =>
+      to.difference(from).inMinutes.abs();
+}
+
+/// Centroide de una ruta (promedio lat/lng de todas sus posiciones)
+class RouteCentroid {
+  final String routeId;
+  final String routeName;
+  final double centroidLat;
+  final double centroidLng;
+
+  const RouteCentroid({
+    required this.routeId,
+    required this.routeName,
+    required this.centroidLat,
+    required this.centroidLng,
+  });
+}
+
+/// Resultado de la asignación espacial
+class RouteAssignmentResult {
+  final String routeId;
+  final String routeName;
+  final double distanceKm;
+
+  const RouteAssignmentResult({
+    required this.routeId,
+    required this.routeName,
+    required this.distanceKm,
+  });
+
+  String get distanceText {
+    if (distanceKm < 1.0) {
+      return '${(distanceKm * 1000).toStringAsFixed(0)} m';
+    }
+    return '${distanceKm.toStringAsFixed(2)} km';
+  }
+}

lib/features/routes/domain/entities/route_entities.dart

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+// lib/features/routes/domain/entities/route_entities.dart
+// Capa de dominio — cero dependencias externas.
+
+class RoutePosition {
+  final int positionId;
+  final double lat;
+  final double lng;
+  final double speed;
+  final DateTime timestamp;
+
+  const RoutePosition({
+    required this.positionId,
+    required this.lat,
+    required this.lng,
+    required this.speed,
+    required this.timestamp,
+  });
+
+  factory RoutePosition.fromJson(Map<String, dynamic> json) => RoutePosition(
+        positionId: json['positionId'] as int,
+        lat: (json['lat'] as num).toDouble(),
+        lng: (json['lng'] as num).toDouble(),
+        speed: (json['speed'] as num).toDouble(),
+        timestamp: DateTime.parse(json['timestamp'] as String),
+      );
+}
+
+class TruckRoute {
+  final String routeId;
+  final String name;
+  final int truckId;
+  final String status;
+  final List<RoutePosition> positions;
+
+  const TruckRoute({
+    required this.routeId,
+    required this.name,
+    required this.truckId,
+    required this.status,
+    required this.positions,
+  });
+
+  factory TruckRoute.fromJson(Map<String, dynamic> json) => TruckRoute(
+        routeId: json['routeId'] as String,
+        name: json['name'] as String,
+        truckId: json['truckId'] as int,
+        status: json['status'] as String,
+        positions: (json['positions'] as List)
+            .map((p) => RoutePosition.fromJson(p))
+            .toList(),
+      );
+
+  /// Posición actual del camión (última del array, excluyendo el regreso)
+  RoutePosition get currentPosition => positions[positions.length ~/ 2];
+
+  /// ETA estimado en minutos desde la posición actual hasta el final
+  int etaFromPosition(int positionIndex) {
+    if (positionIndex >= positions.length - 1) return 0;
+    final current = positions[positionIndex];
+    final last = positions[positions.length - 2]; // penúltima = fin de ruta
+    return last.timestamp.difference(current.timestamp).inMinutes.abs();
+  }
+}
+
+/// Resultado de asignación de ruta por Haversine
+class RouteAssignment {
+  final TruckRoute route;
+  final double distanceKm;
+
+  const RouteAssignment({required this.route, required this.distanceKm});
+}