fix(usb): 解决USB权限拒绝时设备对象为空的问题

- 添加设备对象空值检查避免空指针异常
- 在设备对象为空时记录调试日志
- 确保权限拒绝回调只在设备对象有效时触发
- 保持原有的USB连接处理器回调逻辑

android/src/main/java/com/xiarui/zhiwen/UsbController.java

@@ -142,8 +142,13 @@ public class UsbController {
             if (intent.getAction().equals(ACTION_USB_PERMISSION)) {
                 if (!intent.getBooleanExtra(
                         UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
-                    mPermissionListener.onPermissionDenied(intent
+                    UsbDevice device = intent
-                            .getParcelableExtra(UsbManager.EXTRA_DEVICE));
+                            .getParcelableExtra(UsbManager.EXTRA_DEVICE);
+                    if (device != null) {
+                        mPermissionListener.onPermissionDenied(device);
+                    } else {
+                        l("Permission denied (device extra is null)");
+                    }
 
                     mConnectionHandler.onUsbPermissionDenied();
                 } else {