opt: unread & zan grpc & readlist open with browser (#852)

* opt: unread

* opt: zan grpc

* feat: readlist open with browser

lib/models/common/msg/msg_unread_type.dart

@@ -1,5 +1,10 @@
-enum MsgUnReadType { pm, reply, at, like, sysMsg }
+enum MsgUnReadType {
+  pm('私信'),
+  reply('回复我的'),
+  at('@我'),
+  like('收到的赞'),
+  sysMsg('系统通知');
 
-extension MsgUnReadTypeExt on MsgUnReadType {
-  String get title => const ['私信', '回复我的', '@我', '收到的赞', '系统通知'][index];
+  final String title;
+  const MsgUnReadType(this.title);
 }