feat: implement Kavenegar SMS service and refactor system configurations to use static constants

src/CMSMicroservice.Infrastructure/ConfigureServices.cs

@@ -34,6 +34,7 @@ public static class ConfigureServices
         services.AddScoped<INetworkPlacementService, NetworkPlacementService>();
         services.AddScoped<IAlertService, AlertService>();
         services.AddScoped<IUserNotificationService, UserNotificationService>();
+        services.AddScoped<IKavenegarService, KavenegarService>();
         
         // Daya Loan API Service - قابل تغییر بین Mock و Real
         var useMockDayaApi = configuration.GetValue<bool>("DayaApi:UseMock", false);