feat: Add Face Matcher functionality and related settings

- Implemented FilePathToBitmapConverter for image loading.
- Enhanced DataModel with commands and properties for Face Matcher.
- Created FaceMatcherResultItem model to store results.
- Updated SettingsDto to include Face Matcher paths and tolerance.
- Introduced PickerPreferenceService for managing folder paths.
- Expanded AiSettingsViewModel to manage Face Matcher settings and results.

imagecatalog/Converters/FilePathToBitmapConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+using Avalonia.Media.Imaging;
+
+namespace ImageCatalog_2.Converters;
+
+public sealed class FilePathToBitmapConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is not string path || string.IsNullOrWhiteSpace(path))
+        {
+            return null;
+        }
+
+        try
+        {
+            return new Bitmap(path);
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}