fix: totalItems/totalPages missing from PagingData JSON serialization

core/src/main/kotlin/ai/neuon/utility/paging/PagingData.kt

@@ -26,7 +26,7 @@ import kotlin.math.roundToLong
  * ## buildPagingJsonObject
  * - Serializes the pagination metadata into JSON format:
  *   - "config" → Contains the current page index and page size.
- *   - "page"   → Can include the total number of pages if totalItemsCount is set.
+ *   - "page"   → Includes "totalItems" and "totalPages" when totalItemsCount is set.
  */
 data class PagingData<T>(
     val i: Int, val pageSize: Int, val totalItemsCount: Long? = null,
@@ -52,13 +52,15 @@ data class PagingData<T>(
             put("size", JsonPrimitive(pageSize))
         }
         putJsonObject("page") {
-            totalItemsCount?.also { itemCount ->
-                max(
+            totalItemsCount?.let { itemCount ->
+                val totalPages = max(
                     1, ceil(
                         itemCount.toFloat()
                             .div(pageSize)
                     ).roundToLong()
                 )
+                put("totalItems", JsonPrimitive(itemCount))
+                put("totalPages", JsonPrimitive(totalPages))
             }
         }
     }