TargetFramework update,

reference updates and added tests for Viewer

Shared/Models/ServiceShop.cs

@@ -0,0 +1,8 @@
+using System.Text.Json.Serialization;
+
+namespace OI.Metrology.Shared.Models;
+
+public record ServiceShop(
+        [property: JsonPropertyName("Orders")] IReadOnlyList<Order> Orders,
+        [property: JsonPropertyName("Total")] int Total
+    );