refactor(MainActivity): 将人脸数据清除操作移至后台线程执行

- 使用 lifecycleScope.launch 在协程中执行人脸数据清除
- 通过 withContext(Dispatchers.IO) 确保清除操作在 IO 线程运行
- 避免主线程阻塞提升界面响应性能
- 保持原有的用户提示和缓存更新逻辑不变

app/src/main/java/com/sw/dualscreen/activity/MainActivity.kt

@@ -211,7 +211,11 @@ class MainActivity : BaseActivity<ActivityMainBinding>() {
         binding.tvTitleTime.setOnClickListener {
             EnvSwitchDialog(context = this, onEnvChanged = {
                 showWaitingDialog("重置人脸数据中……")
-                FaceServer.getInstance().clearAllFaces()
+                lifecycleScope.launch {
+                    withContext(Dispatchers.IO) {
+                        FaceServer.getInstance().clearAllFaces()
+                    }
+                }
                 viewModel.getUserFaceCache(pageNo = 1, onSuccess = {
                     hideWaitingDialog()
                     ToastUtils.showToast("人脸数据已更新")