refactor(android): 重构Android端实现使用官方SDK替代反射调用

- 移除反射机制，直接集成CH934XLib.jar官方SDK
- 添加CH934XManager初始化逻辑并处理Application上下文兼容性
- 实现设备枚举、串口打开关闭等核心功能的直接调用
- 集成IDataCallback和IModemStatus回调处理
- 更新异常回调机制，支持原生层主动推送异常事件
- 优化设备连接状态管理和USB权限处理
- 为Dart模型类添加相等性比较和哈希码实现
- 更新示例应用UI以适配新的串口索引选择逻辑

lib/src/models/ch934x_device_info.dart

@@ -30,6 +30,16 @@ class Ch934xSerialPortInfo {
       driverName: map['driverName'] as String?,
     );
   }
+
+  @override
+  bool operator ==(Object other) =>
+      other is Ch934xSerialPortInfo &&
+      other.portIndex == portIndex &&
+      other.devicePath == devicePath &&
+      other.driverName == driverName;
+
+  @override
+  int get hashCode => Object.hash(portIndex, devicePath, driverName);
 }
 
 /// 文档 4.1.4 中 `UsbHelper.getCH934XDeviceList` 返回的设备信息。
@@ -104,4 +114,28 @@ class Ch934xDeviceInfo {
       serialPorts: ports,
     );
   }
+
+  @override
+  bool operator ==(Object other) =>
+      other is Ch934xDeviceInfo &&
+      other.deviceId == deviceId &&
+      other.vendorId == vendorId &&
+      other.productId == productId &&
+      other.deviceType == deviceType &&
+      other.serialNumber == serialNumber &&
+      other.productName == productName &&
+      other.manufacturerName == manufacturerName &&
+      other.interfaceCount == interfaceCount;
+
+  @override
+  int get hashCode => Object.hash(
+        deviceId,
+        vendorId,
+        productId,
+        deviceType,
+        serialNumber,
+        productName,
+        manufacturerName,
+        interfaceCount,
+      );
 }