fix: update week calculation to use Saturday as the start of the week

src/CMSMicroservice.Application/CommissionCQ/Queries/GetAvailableWeeks/GetAvailableWeeksQueryHandler.cs

@@ -122,10 +122,12 @@ public class GetAvailableWeeksQueryHandler : IRequestHandler<GetAvailableWeeksQu
     private static (DateTime startDate, DateTime endDate) GetWeekRange(DateTime date)
     {
         var dayOfWeek = (int)date.DayOfWeek;
-        var daysToMonday = dayOfWeek == 0 ? 6 : dayOfWeek - 1; // اگر یکشنبه باشد، 6 روز عقب برو
+        // محاسبه تعداد روزهایی که باید عقب برویم تا به شنبه برسیم
+        // شنبه = 6, یکشنبه = 0, دوشنبه = 1, ..., جمعه = 5
+        var daysToSaturday = dayOfWeek == 6 ? 0 : (dayOfWeek + 1) % 7;
         
-        var startDate = date.Date.AddDays(-daysToMonday);
-        var endDate = startDate.AddDays(6);
+        var startDate = date.Date.AddDays(-daysToSaturday);
+        var endDate = startDate.AddDays(6).AddHours(23).AddMinutes(59).AddSeconds(59);
         
         return (startDate, endDate);
     }