feat: Add support for thumbnail inclusion in AI processing and enhance UI bindings

imagecatalog/Services/IAiExtractionService.cs

@@ -9,6 +9,7 @@ public sealed class AiExtractionRequest
 {
     public required string SearchRoot { get; init; }
     public required bool Recursive { get; init; }
+    public bool IncludeThumbnails { get; init; }
     public required string ModelsFolderPath { get; init; }
     public bool UseGpu { get; init; }
     public string CsvOutputPath { get; init; } = string.Empty;