refactor(masque): allow empty credentials and enable TLS by default (#10601)

- Accept empty username/password, which is common in MASQUE + WARP
  setups where credentials are optional.
- Enable TLS by default, as forced by Xray and sing-box.

v2rayN/ServiceLib/Handler/Data/ConfigDbHandler.cs

@@ -777,10 +777,6 @@ public static class ConfigDbHandler
         {
             profileItem.StreamSecurity = Global.StreamSecurity;
         }
-        if (profileItem.Password.IsNullOrEmpty())
-        {
-            return -1;
-        }
         await AddServerCommon(profileItem, toFile);
         return 0;
     }

v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs

@@ -656,8 +656,11 @@ public partial class CoreConfigV2rayService
 
                 case "masque":
                     var headers = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
-                    var authValue = $"Basic {Utils.Base64Encode($"{_node.Username}:{_node.Password}")}";
+                    if (!string.IsNullOrEmpty(_node.Username) || !string.IsNullOrEmpty(_node.Password))
-                    headers.Add("Authorization", authValue);
+                    {
+                        var authValue = $"Basic {Utils.Base64Encode($"{_node.Username}:{_node.Password}")}";
+                        headers.Add("Authorization", authValue);
+                    }
                     if (!string.IsNullOrEmpty(protocolExtra?.MasqueHeaders))
                     {
                         var userHeaders = Utils.ParseHeaders(protocolExtra.MasqueHeaders)

v2rayN/ServiceLib/ViewModels/AddServerViewModel.cs

@@ -501,7 +501,7 @@ public partial class AddServerViewModel : MyReactiveObject, ICloseable
                 return;
             }
         }
-        if (SelectedSource.ConfigType is not EConfigType.SOCKS and not EConfigType.HTTP)
+        if (SelectedSource.ConfigType is not EConfigType.SOCKS and not EConfigType.HTTP and not EConfigType.MASQUE)
         {
             if (SelectedSource.Password.IsNullOrEmpty())
             {

v2rayN/v2rayN.Desktop/Views/AddServerWindow.axaml.cs

@@ -311,6 +311,11 @@ public partial class AddServerWindow : WindowBase<AddServerViewModel>
                 gridMasque.IsVisible = true;
                 sepa2.IsVisible = false;
                 gridTransport.IsVisible = false;
+                lstStreamSecurity.Remove(string.Empty);
+                if (string.IsNullOrEmpty(profileItem.StreamSecurity))
+                {
+                    profileItem.StreamSecurity = lstStreamSecurity.First();
+                }
                 break;
         }
         cmbStreamSecurity.ItemsSource = lstStreamSecurity;
@@ -334,7 +339,7 @@ public partial class AddServerWindow : WindowBase<AddServerViewModel>
 
     private void CmbStreamSecurity_SelectionChanged(object? sender, SelectionChangedEventArgs e)
     {
-        var security = cmbStreamSecurity.SelectedItem.ToString();
+        var security = cmbStreamSecurity.SelectedItem?.ToString();
         if (security == Global.StreamSecurityReality)
         {
             gridRealityMore.IsVisible = true;

v2rayN/v2rayN/Views/AddServerWindow.xaml.cs

@@ -299,6 +299,11 @@ public partial class AddServerWindow
                 gridMasque.Visibility = Visibility.Visible;
                 sepa2.Visibility = Visibility.Collapsed;
                 gridTransport.Visibility = Visibility.Collapsed;
+                lstStreamSecurity.Remove(string.Empty);
+                if (string.IsNullOrEmpty(profileItem.StreamSecurity))
+                {
+                    profileItem.StreamSecurity = lstStreamSecurity.First();
+                }
                 break;
         }
         cmbStreamSecurity.ItemsSource = lstStreamSecurity;
@@ -322,7 +327,7 @@ public partial class AddServerWindow
 
     private void CmbStreamSecurity_SelectionChanged(object sender, SelectionChangedEventArgs e)
     {
-        var security = cmbStreamSecurity.SelectedItem.ToString();
+        var security = cmbStreamSecurity.SelectedItem?.ToString();
         if (security == Global.StreamSecurityReality)
         {
             gridRealityMore.Visibility = Visibility.Visible;