levelup, item and synchro device fixes

nksrv/LobbyServer/Msgs/User/ReadMail.cs

@@ -0,0 +1,23 @@
+using nksrv.Utils;
+using Swan;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace nksrv.LobbyServer.Msgs.User
+{
+    [PacketPath("/mail/read")]
+    public class ReadMail : LobbyMsgHandler
+    {
+        protected override async Task HandleAsync()
+        {
+            var req = await ReadData<ReqReadMail>();
+
+            var r = new ResReadMail();
+            //TODO
+            WriteData(r);
+        }
+    }
+}