Add half-body portrait support: update API, UI, and localization for new portrait type

src/HSchool.Server/Game/SwarmUiSettings.cs

@@ -25,8 +25,18 @@ internal sealed class SwarmUiSettings
 
     public SwarmUiPreset Avatar { get; init; } = new();
 
+    public SwarmUiPreset HalfBody { get; init; } = new();
+
     public SwarmUiPreset FullBody { get; init; } = new();
 
+    public SwarmUiPreset PresetFor(PortraitKind kind) => kind switch
+    {
+        PortraitKind.Avatar => Avatar,
+        PortraitKind.Half => HalfBody,
+        PortraitKind.Full => FullBody,
+        _ => throw new ArgumentOutOfRangeException(nameof(kind)),
+    };
+
     internal sealed class SwarmUiPreset
     {
         public int Width { get; init; } = 512;