feat: implement VAT management service and integrate VAT calculations across components

src/FrontOffice.Main/Pages/Store/Orders.razor.cs

@@ -9,6 +9,7 @@ namespace FrontOffice.Main.Pages.Store;
 public partial class Orders : ComponentBase
 {
     [Inject] private OrderService OrderService { get; set; } = default!;
+    [Inject] private VATService VAT { get; set; } = default!;
 
     private List<GetUserOrderResponse> _orders = new();
     private bool _loading;
@@ -18,6 +19,7 @@ public partial class Orders : ComponentBase
         _loading = true;
         try
         {
+            await VAT.LoadAsync();
             _orders = await OrderService.GetOrdersAsync();
         }
         catch (Exception ex)