fix: update fallback behavior to return empty responses when backend is unavailable

src/FrontOffice.Main/Utilities/WalletService.cs

@@ -32,8 +32,8 @@ public class WalletService
         }
         catch
         {
-            // Fallback to mock data if backend is unavailable
-            return new WalletBalances(350_000, 0, 1_250_000);
+            // Return zero balances if backend is unavailable
+            return new WalletBalances(0, 0, 0);
         }
     }
 
@@ -62,15 +62,8 @@ public class WalletService
         }
         catch
         {
-            // Fallback to mock data if backend is unavailable
-            var _transactions = new List<WalletTransaction>
-            {
-                new(DateTime.Now.AddDays(-1).ToString(), 500_000, "درگاه بانکی", "شارژ کیف پول"),
-                new(DateTime.Now.AddDays(-2).ToString(), 200_000, "شبکه/معرف", "پاداش شبکه"),
-                new(DateTime.Now.AddDays(-4).ToString(), -120_000, "خرید", "برداشت بابت سفارش #1452"),
-                new(DateTime.Now.AddDays(-9).ToString(), 900_000, "کیف پول شرکای تجاری", "اعتبار خرید"),
-            };
-            return _transactions.OrderByDescending(t => t.Date).ToList();
+            // Return empty list if backend is unavailable
+            return new List<WalletTransaction>();
         }
     }
 
@@ -158,7 +151,8 @@ public class WalletService
         }
         catch
         {
-            return new WithdrawalSettings(1_000_000);
+            // Return default settings if backend is unavailable
+            return new WithdrawalSettings(0);
         }
     }
 }