opt: save reply (#1860)

* opt: save reply

* opt: reply save switch

* remove unneeded sort

* clear sub replies [skip ci]

---------

Co-authored-by: dom <githubaccount56556@proton.me>

lib/pages/setting/models/extra_settings.dart

@@ -354,6 +354,13 @@ List<SettingsModel> get extraSettings => [
     setKey: SettingBoxKey.showDmChart,
     defaultVal: false,
   ),
+  const SwitchModel(
+    title: '记录评论',
+    leading: Icon(Icons.message_outlined),
+    setKey: SettingBoxKey.saveReply,
+    defaultVal: true,
+    needReboot: true,
+  ),
   const SwitchModel(
     title: '发评反诈',
     subtitle: '发送评论后检查评论是否可见',