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.

tests/HSchool.Server.Tests/SwarmUiClientTests.cs

@@ -72,6 +72,63 @@ public class SwarmUiClientTests
             Task.FromResult(new HttpResponseMessage(HttpStatusCode.ServiceUnavailable));
     }
 
+    [Fact]
+    public async Task GenerateAsync_SendsClipStopAtLayerForClipSkip()
+    {
+        var handler = new CapturingHandler();
+        var http = new HttpClient(handler) { BaseAddress = new Uri("http://swarm.test/") };
+        var client = new SwarmUiClient(
+            http,
+            Options.Create(new SwarmUiOptions { BaseUrl = "http://swarm.test", TimeoutSeconds = 30 }),
+            NullLogger<SwarmUiClient>.Instance);
+
+        var settings = new SwarmUiSettings
+        {
+            Model = "model.safetensors",
+            Steps = 4,
+            CfgScale = 2,
+            ClipSkip = 2,
+            Sampler = "dpmpp_sde",
+            Scheduler = "karras",
+            Avatar = new SwarmUiSettings.SwarmUiPreset { Width = 512, Height = 512 },
+        };
+
+        await client.GenerateAsync("a student", "bad", settings, PortraitKind.Avatar, CancellationToken.None);
+
+        using var document = JsonDocument.Parse(handler.GenerateBody!);
+        Assert.Equal(-2, document.RootElement.GetProperty("clipstopatlayer").GetInt32());
+        Assert.False(document.RootElement.TryGetProperty("clipskip", out _));
+    }
+
+    private sealed class CapturingHandler : HttpMessageHandler
+    {
+        public string? GenerateBody { get; private set; }
+
+        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            if (request.RequestUri!.AbsolutePath.Contains("GetNewSession", StringComparison.Ordinal))
+            {
+                var session = JsonSerializer.Serialize(new { session_id = "sess-1" });
+                return new HttpResponseMessage(HttpStatusCode.OK)
+                {
+                    Content = new StringContent(session, Encoding.UTF8, "application/json"),
+                };
+            }
+
+            if (request.RequestUri.AbsolutePath.Contains("GenerateText2Image", StringComparison.Ordinal))
+            {
+                GenerateBody = request.Content is null ? null : await request.Content.ReadAsStringAsync(cancellationToken);
+                var payload = JsonSerializer.Serialize(new { images = new[] { "data:image/png;base64,iVBORw0KGgo=" } });
+                return new HttpResponseMessage(HttpStatusCode.OK)
+                {
+                    Content = new StringContent(payload, Encoding.UTF8, "application/json"),
+                };
+            }
+
+            return new HttpResponseMessage(HttpStatusCode.NotFound);
+        }
+    }
+
     private sealed class FakeHandler : HttpMessageHandler
     {
         public List<string> Requests { get; } = [];