xray mux add more option

https://github.com/2dust/v2rayN/issues/5565

v2rayN/ServiceLib/Handler/ConfigHandler.cs

@@ -173,6 +173,13 @@ namespace ServiceLib.Handler
                 config.speedTestItem.speedPingTestUrl = Global.SpeedPingTestUrl;
             }
 
+            config.mux4RayItem ??= new()
+                {
+                    concurrency = 8,
+                    xudpConcurrency = 16,
+                    xudpProxyUDP443 = "reject"
+                };
+
             if (config.mux4SboxItem == null)
             {
                 config.mux4SboxItem = new()

v2rayN/ServiceLib/Handler/CoreConfig/CoreConfigV2ray.cs

@@ -770,7 +770,9 @@ namespace ServiceLib.Handler.CoreConfig
                 if (enabled)
                 {
                     outbound.mux.enabled = true;
-                    outbound.mux.concurrency = 8;
+                    outbound.mux.concurrency = _config.mux4RayItem.concurrency;
+                    outbound.mux.xudpConcurrency = _config.mux4RayItem.xudpConcurrency;
+                    outbound.mux.xudpProxyUDP443 = _config.mux4RayItem.xudpProxyUDP443;
                 }
                 else
                 {

v2rayN/ServiceLib/Models/Config.cs

@@ -41,6 +41,7 @@
         public UIItem uiItem { get; set; }
         public ConstItem constItem { get; set; }
         public SpeedTestItem speedTestItem { get; set; }
+        public Mux4RayItem mux4RayItem { get; set; }
         public Mux4SboxItem mux4SboxItem { get; set; }
         public HysteriaItem hysteriaItem { get; set; }
         public ClashUIItem clashUIItem { get; set; }

v2rayN/ServiceLib/Models/ConfigItems.cs

@@ -197,6 +197,14 @@
         public int Index { get; set; }
     }
 
+    [Serializable]
+    public class Mux4RayItem
+    {
+        public int? concurrency { get; set; }
+        public int? xudpConcurrency { get; set; }
+        public string? xudpProxyUDP443 { get; set; }
+    }
+
     [Serializable]
     public class Mux4SboxItem
     {

v2rayN/ServiceLib/Models/V2rayConfig.cs

@@ -343,15 +343,10 @@ namespace ServiceLib.Models
 
     public class Mux4Ray
     {
-        /// <summary>
-        ///
-        /// </summary>
         public bool enabled { get; set; }
-
+        public int? concurrency { get; set; }
-        /// <summary>
+        public int? xudpConcurrency { get; set; }
-        ///
+        public string? xudpProxyUDP443 { get; set; }
-        /// </summary>
-        public int concurrency { get; set; }
     }
 
     public class Response4Ray