fix: remove discount balance UI entirely — 100% discount auto-applied by server

src/FrontOffice.Main/Pages/DiscountStore/Checkout.razor.cs

@@ -15,48 +15,15 @@ public partial class Checkout
     private CustomerAddressModel? _selectedAddress;
     private bool _loadingAddresses;
 
-    private long _discountBalance;
     private string? _notes;
     private bool _placing;
 
-    /// <summary>
-    /// Maximum discount allowed based on cart items' MaxDiscountPercent
-    /// </summary>
-    private long MaxAllowedDiscount => DiscountCart.TotalDiscount;
-
-    /// <summary>
-    /// Maximum the user can actually use = min(balance, allowed discount)
-    /// Always applied at 100% — no user selection
-    /// </summary>
-    private long MaxUsable => Math.Min(_discountBalance, MaxAllowedDiscount);
-
-    /// <summary>
-    /// Amount to be charged via payment gateway (total minus auto-applied discount)
-    /// </summary>
-    private long GatewayAmount => DiscountCart.TotalPrice - MaxUsable;
-
     private bool CanPlaceOrder => DiscountCart.Items.Count > 0 && _selectedAddress is not null;
 
     protected override async Task OnInitializedAsync()
     {
         await DiscountCart.EnsureInitializedAsync();
-
-        var addressTask = LoadAddresses();
-        var balanceTask = LoadDiscountBalance();
-        await Task.WhenAll(addressTask, balanceTask);
-    }
-
-    private async Task LoadDiscountBalance()
-    {
-        try
-        {
-            var balances = await WalletService.GetBalancesAsync();
-            _discountBalance = balances.DiscountBalance;
-        }
-        catch
-        {
-            _discountBalance = 0;
-        }
+        await LoadAddresses();
     }
 
     private async Task LoadAddresses()
@@ -98,10 +65,10 @@ public partial class Checkout
         _placing = true;
         try
         {
-            // Always use maximum possible discount (100%)
+            // Always use 100% discount — send full price, server will apply max from wallet
             var result = await DiscountOrderService.PlaceOrderAsync(
                 _selectedAddress.Id,
-                MaxUsable,
+                DiscountCart.TotalPrice,
                 _notes);
 
             if (!result.Success)