feat: everything up to bluetooth scanning

lib/model/bluetooth_device_model.dart

@@ -0,0 +1,47 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'bluetooth_device_model.freezed.dart';
+part 'bluetooth_device_model.g.dart';
+
+/// Enum representing the type of Bluetooth device
+enum DeviceType {
+  /// Universal Shifters device
+  universalShifters,
+
+  /// Other unspecified device types
+  other,
+}
+
+/// Model representing a Bluetooth device
+@freezed
+abstract class BluetoothDeviceModel with _$BluetoothDeviceModel {
+  const factory BluetoothDeviceModel({
+    /// Unique identifier for the device
+    required String id,
+
+    /// Name of the device as advertised
+    String? name,
+
+    /// MAC address of the device
+    required String address,
+
+    /// Signal strength indicator (RSSI)
+    int? rssi,
+
+    /// Type of the device
+    @Default(DeviceType.other) DeviceType type,
+
+    /// Whether the device is currently connected
+    @Default(false) bool isConnected,
+
+    /// Additional device information
+    Map<String, dynamic>? manufacturerData,
+
+    /// Service UUIDs advertised by the device
+    List<String>? serviceUuids,
+  }) = _BluetoothDeviceModel;
+
+  /// Create a BluetoothDeviceModel from JSON
+  factory BluetoothDeviceModel.fromJson(Map<String, dynamic> json) =>
+      _$BluetoothDeviceModelFromJson(json);
+}