Added avalonia integration and remote proof of concept

Catalog.Communication/Models/RaceFileUploadRequest.cs

@@ -0,0 +1,16 @@
+namespace Catalog.Communication.Models;
+
+public sealed class RaceFileUploadRequest
+{
+    public int? CodFile { get; init; }
+
+    public long? Id { get; init; }
+
+    public required string FileName { get; init; }
+
+    public required Stream FileStream { get; init; }
+
+    public string FormFieldName { get; init; } = "fileName";
+
+    public string? ContentType { get; init; }
+}