Add OtpDialogService for mobile-friendly OTP authentication dialog

src/FrontOffice.Main/Utilities/OrderService.cs

@@ -0,0 +1,47 @@
+namespace FrontOffice.Main.Utilities;
+
+public enum PaymentMethod
+{
+    Wallet = 1,
+}
+
+public enum OrderStatus
+{
+    Pending = 0,
+    Paid = 1,
+}
+
+public record OrderItem(long ProductId, string Title, string ImageUrl, long UnitPrice, int Quantity)
+{
+    public long LineTotal => UnitPrice * Quantity;
+}
+
+public class Order
+{
+    public long Id { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.Now;
+    public OrderStatus Status { get; set; } = OrderStatus.Pending;
+    public PaymentMethod PaymentMethod { get; set; } = PaymentMethod.Wallet;
+    public long AddressId { get; set; }
+    public string AddressSummary { get; set; } = string.Empty;
+    public List<OrderItem> Items { get; set; } = new();
+    public long Total => Items.Sum(i => i.LineTotal);
+}
+
+public class OrderService
+{
+    private long _seq = 1000;
+    private readonly List<Order> _orders = new();
+
+    public Task<List<Order>> GetOrdersAsync() => Task.FromResult(_orders.OrderByDescending(o => o.CreatedAt).ToList());
+
+    public Task<Order?> GetOrderAsync(long id) => Task.FromResult(_orders.FirstOrDefault(o => o.Id == id));
+
+    public Task<long> CreateOrderAsync(Order order)
+    {
+        order.Id = Interlocked.Increment(ref _seq);
+        _orders.Add(order);
+        return Task.FromResult(order.Id);
+    }
+}
+