Add SwarmUI settings management and portrait generation enhancements

- Introduced new API endpoints for managing SwarmUI settings, including fetching and saving presets and age rules.
- Updated the portrait generation logic to utilize the new settings structure, allowing for dynamic preset selection based on age.
- Enhanced UI components to support SwarmUI settings, including localization for new strings and improved styling for settings sections.
- Added tests to verify the functionality of new settings endpoints and portrait generation behavior.

This commit lays the groundwork for more flexible and user-friendly portrait generation options.

tests/HSchool.AppHost.Tests/PortraitApiTests.cs

@@ -86,6 +86,18 @@ public class PortraitApiTests(AppHostFixture fixture)
         Assert.Equal("avatar", payload!.Kind);
         Assert.Contains("age", payload.Positive, StringComparison.OrdinalIgnoreCase);
         Assert.False(string.IsNullOrWhiteSpace(payload.Negative));
+        Assert.False(string.IsNullOrWhiteSpace(payload.PresetId));
+    }
+
+    [Fact]
+    public async Task GetSwarmUiSettings_ReturnsPresets()
+    {
+        using var client = fixture.App.CreateHttpClient("server");
+
+        var settings = await client.GetFromJsonAsync<SwarmUiSettingsPayload>(TestContext.Current.CancellationToken);
+        Assert.NotNull(settings);
+        Assert.NotEmpty(settings!.Presets);
+        Assert.False(string.IsNullOrWhiteSpace(settings.ActivePresetId));
     }
 
     [Fact]
@@ -134,7 +146,17 @@ public class PortraitApiTests(AppHostFixture fixture)
         bool HasFullBody,
         string? CustomPortraitPrompt);
 
-    private sealed record PortraitPromptPayload(string Kind, string Positive, string Negative, string? PromptExtra);
+    private sealed record PortraitPromptPayload(
+        string Kind,
+        string Positive,
+        string Negative,
+        string? PromptExtra,
+        string PresetId,
+        string PresetLabel);
+
+    private sealed record SwarmUiSettingsPayload(string ActivePresetId, IReadOnlyList<SwarmUiPresetPayload> Presets);
+
+    private sealed record SwarmUiPresetPayload(string Id, string Label);
 
     private sealed record SavesDirectoryResponse(string Path);
 }