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");

src/HSchool.Server/Game/SwarmUiSettings.cs

@@ -15,6 +15,8 @@ internal sealed class SwarmUiSettings
 
     public string Sampler { get; init; } = "euler";
 
+    public string Scheduler { get; init; } = "";
+
     public long Seed { get; init; } = -1;
 
     public string Positive { get; init; } = "";

src/HSchool.Server/swarmui.json

@@ -3,7 +3,8 @@
   "steps": 4,
   "cfgScale": 2,
   "clipSkip": 2,
-  "sampler": "DPM++ SDE Karras",
+  "sampler": "dpmpp_sde",
+  "scheduler": "karras",
   "seed": 3346112079,
   "positive": "cinematic photo, realist detail, detailed character expressions, amazing quality, analog film grain, school portrait photograph, neutral background, natural lighting, realistic, sharp focus",
   "negative": "(low quality, worst quality:1.4), cgi, text, signature, watermark, extra limbs, nsfw, nude, naked, explicit, blurry, deformed, bad anatomy, logo",