Add the mixed option in Stack in Tun mode settings

#6441

v2rayN/ServiceLib/Global.cs

@@ -209,7 +209,7 @@ public class Global
         public static readonly List<string> RuleNetworks = new() { "", "tcp", "udp", "tcp,udp" };
         public static readonly List<string> destOverrideProtocols = ["http", "tls", "quic", "fakedns", "fakedns+others"];
         public static readonly List<string> TunMtus = new() { "1280", "1408", "1500", "9000" };
-        public static readonly List<string> TunStacks = new() { "gvisor", "system" };
+        public static readonly List<string> TunStacks = new() { "gvisor", "system", "mixed" };
         public static readonly List<string> PresetMsgFilters = new() { "proxy", "direct", "block", "" };
         public static readonly List<string> SingboxMuxs = new() { "h2mux", "smux", "yamux", "" };
         public static readonly List<string> TuicCongestionControls = new() { "cubic", "new_reno", "bbr" };