отредачен Program.cs, "последний штрих" (но я этому не верю)

Confectionery/ConfectioneryClientApp/Program.cs

@@ -1,3 +1,5 @@
+using ConfectioneryClientApp;
+
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
@@ -5,6 +7,8 @@ builder.Services.AddControllersWithViews();
 
 var app = builder.Build();
 
+APIClient.Connect(builder.Configuration);
+
 // Configure the HTTP request pipeline.
 if (!app.Environment.IsDevelopment())
 {