Add serial capability for Bluetooth Classic and USB OTG

flutter_app/android/app/src/main/AndroidManifest.xml

@@ -15,6 +15,11 @@
     <uses-permission android:name="android.permission.VIBRATE" />
     <uses-permission android:name="android.permission.BODY_SENSORS" />
     <uses-permission android:name="android.permission.HIGH_SAMPLING_RATE_SENSORS" />
+    <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" android:maxSdkVersion="30" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" android:usesPermissionFlags="neverForLocation" />
+    <uses-feature android:name="android.hardware.usb.host" android:required="false" />
 
     <application
         android:label="OpenClaw"

flutter_app/lib/providers/node_provider.dart

@@ -9,6 +9,7 @@ import '../services/capabilities/flash_capability.dart';
 import '../services/capabilities/location_capability.dart';
 import '../services/capabilities/screen_capability.dart';
 import '../services/capabilities/sensor_capability.dart';
+import '../services/capabilities/serial_capability.dart';
 import '../services/capabilities/vibration_capability.dart';
 import '../services/native_bridge.dart';
 import '../services/node_service.dart';
@@ -29,6 +30,7 @@ class NodeProvider extends ChangeNotifier with WidgetsBindingObserver {
   final _locationCapability = LocationCapability();
   final _screenCapability = ScreenCapability();
   final _sensorCapability = SensorCapability();
+  final _serialCapability = SerialCapability();
   final _vibrationCapability = VibrationCapability();
 
   NodeState get state => _state;
@@ -156,6 +158,11 @@ class NodeProvider extends ChangeNotifier with WidgetsBindingObserver {
       _sensorCapability.commands.map((c) => '${_sensorCapability.name}.$c').toList(),
       (cmd, params) => _sensorCapability.handleWithPermission(cmd, params),
     );
+    _nodeService.registerCapability(
+      _serialCapability.name,
+      _serialCapability.commands.map((c) => '${_serialCapability.name}.$c').toList(),
+      (cmd, params) => _serialCapability.handleWithPermission(cmd, params),
+    );
   }
 
   Future<void> _init() async {
@@ -306,6 +313,7 @@ class NodeProvider extends ChangeNotifier with WidgetsBindingObserver {
     _nodeService.dispose();
     _cameraCapability.dispose();
     _flashCapability.dispose();
+    _serialCapability.dispose();
     NativeBridge.stopNodeService();
     super.dispose();
   }

flutter_app/lib/screens/node_screen.dart

@@ -216,6 +216,18 @@ class _NodeScreenState extends State<NodeScreen> {
                       'Read accelerometer, gyroscope, magnetometer, barometer',
                       Icons.sensors,
                     ),
+                    _capabilityTile(
+                      theme,
+                      'Bluetooth Serial',
+                      'Connect to Micro:bit, HC-05 and classic BT serial devices',
+                      Icons.bluetooth,
+                    ),
+                    _capabilityTile(
+                      theme,
+                      'USB Serial',
+                      'Wired serial via USB OTG (Arduino, Micro:bit, FTDI)',
+                      Icons.usb,
+                    ),
                     const SizedBox(height: 16),
 
                     // Device Info