feat(package): enhance pagination logic in GetCustomerPackagePurchaseRollupQueryHandler

- Updated pagination handling to allow for exporting all results when PageSize is set to 0.
- Adjusted page size and number calculations to accommodate the new export functionality.
- Improved clarity in pagination logic by distinguishing between export and paginated results.

src/CMSMicroservice.Application/UserPackagePurchaseCQ/Queries/GetCustomerPackagePurchaseRollup/GetCustomerPackagePurchaseRollupQueryHandler.cs

@@ -22,7 +22,9 @@ public class GetCustomerPackagePurchaseRollupQueryHandler
         var filter = request.Filter;
         var pagination = request.PaginationState ?? new PaginationState { PageNumber = 1, PageSize = 20 };
         if (pagination.PageNumber < 1) pagination.PageNumber = 1;
-        if (pagination.PageSize < 1) pagination.PageSize = 20;
+        // PageSize == 0 → خروجی کامل (بدون صفحه‌بندی)، مثلاً Excel
+        var exportAll = pagination.PageSize == 0;
+        if (!exportAll && pagination.PageSize < 1) pagination.PageSize = 20;
 
         // خرید معتبر: بدون تراکنش یا تراکنش موفق
         var purchases = _context.UserPackagePurchases
@@ -104,14 +106,18 @@ public class GetCustomerPackagePurchaseRollupQueryHandler
             .ToList();
 
         var totalCount = grouped.Count;
-        var pageSize = pagination.PageSize;
-        var pageNumber = pagination.PageNumber;
-        var totalPage = pageSize > 0 ? (int)Math.Ceiling(totalCount / (double)pageSize) : 0;
+        var pageNumber = exportAll ? 1 : pagination.PageNumber;
+        var pageSize = exportAll ? totalCount : pagination.PageSize;
+        var totalPage = exportAll || pageSize <= 0
+            ? (totalCount > 0 ? 1 : 0)
+            : (int)Math.Ceiling(totalCount / (double)pageSize);
 
-        var pageModels = grouped
-            .Skip((pageNumber - 1) * pageSize)
-            .Take(pageSize)
-            .ToList();
+        var pageModels = exportAll
+            ? grouped
+            : grouped
+                .Skip((pageNumber - 1) * pageSize)
+                .Take(pageSize)
+                .ToList();
 
         return new GetCustomerPackagePurchaseRollupResponseDto
         {
@@ -121,8 +127,8 @@ public class GetCustomerPackagePurchaseRollupQueryHandler
                 PageSize = pageSize,
                 TotalCount = totalCount,
                 TotalPage = totalPage,
-                HasPrevious = pageNumber > 1,
-                HasNext = pageNumber < totalPage
+                HasPrevious = !exportAll && pageNumber > 1,
+                HasNext = !exportAll && pageNumber < totalPage
             },
             Models = pageModels
         };