bluetooth connectivity layer added

app/lib/transport/bluetooth/bluetooth_device_info.dart

@@ -0,0 +1,23 @@
+/// DMC-eigenes, plugin-unabhaengiges Geraetemodell fuer gekoppelte
+/// Bluetooth-Classic-Geraete (Doku Kommunikationsschicht Abschnitt 3.2).
+/// Haelt `flutter_classic_bluetooth`-Typen aus der Oberflaeche heraus, damit
+/// nur transport/bluetooth/ das Paket kennen muss.
+class BluetoothDeviceInfo {
+  const BluetoothDeviceInfo({required this.address, this.name});
+
+  final String address;
+  final String? name;
+
+  String get displayName => name ?? address;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is BluetoothDeviceInfo && other.address == address;
+
+  @override
+  int get hashCode => address.hashCode;
+
+  @override
+  String toString() => 'BluetoothDeviceInfo($address, $name)';
+}