Final commit.

lib/domain/entity/address.dart

@@ -0,0 +1,55 @@
+/// Postanschrift — Value-Object, identitätslos.
+///
+/// Tritt im Domain an drei Stellen auf: am `Customer` (Stamm-Adresse) und
+/// als `deliveryAddressSnapshot` auf der `Delivery` (eingefrorene Kopie der
+/// Adresse zum Zeitpunkt der Belegerzeugung, damit nachträgliche Änderungen
+/// am Stammdatensatz die ausgelieferte Tour nicht „verschieben"). Spiegelt
+/// das Backend-DTO `Address` 1:1.
+class Address {
+  const Address({
+    required this.street,
+    required this.houseNumber,
+    required this.postalCode,
+    required this.city,
+    required this.country,
+  });
+
+  final String street;
+  final String houseNumber;
+  final String postalCode;
+  final String city;
+  final String country;
+
+  /// Einzeilige Darstellung für Listen/Header.
+  String get oneLine =>
+      '$street $houseNumber, $postalCode $city';
+
+  Address copyWith({
+    String? street,
+    String? houseNumber,
+    String? postalCode,
+    String? city,
+    String? country,
+  }) {
+    return Address(
+      street: street ?? this.street,
+      houseNumber: houseNumber ?? this.houseNumber,
+      postalCode: postalCode ?? this.postalCode,
+      city: city ?? this.city,
+      country: country ?? this.country,
+    );
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is Address &&
+          other.street == street &&
+          other.houseNumber == houseNumber &&
+          other.postalCode == postalCode &&
+          other.city == city &&
+          other.country == country;
+
+  @override
+  int get hashCode => Object.hash(street, houseNumber, postalCode, city, country);
+}