Enhance SwarmUI settings by adding a scheduler property and updating the client to send clip stop at layer instead of clip skip. Added tests to verify the new behavior.

src/HSchool.Server/Game/SwarmUiClient.cs

@@ -90,9 +90,15 @@ internal sealed class SwarmUiClient
                 body["sampler"] = settings.Sampler;
             }
 
+            if (!string.IsNullOrWhiteSpace(settings.Scheduler))
+            {
+                body["scheduler"] = settings.Scheduler;
+            }
+
             if (settings.ClipSkip > 0)
             {
-                body["clipskip"] = settings.ClipSkip;
+                // SwarmUI "CLIP Stop At Layer" — clip skip N is layer -N from the end.
+                body["clipstopatlayer"] = -settings.ClipSkip;
             }
 
             using var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");