Surprise Box Implementation

- Added showCashInventory after a successful gachapon opening in the CashShopSurpriseHandler.
- Added getItemsSize() condition to check the inventory size before proceeding with the cash shop surprise opening

src/main/java/net/server/channel/handlers/CashShopSurpriseHandler.java

@@ -41,6 +41,7 @@ public class CashShopSurpriseHandler extends AbstractPacketHandler {
             if (cssResult != null) {
                 Item cssItem = cssResult.getLeft(), cssBox = cssResult.getRight();
                 c.sendPacket(PacketCreator.onCashGachaponOpenSuccess(c.getAccID(), cssBox.getSN(), cssBox.getQuantity(), cssItem, cssItem.getItemId(), cssItem.getQuantity(), true));
+                c.sendPacket(PacketCreator.showCashInventory(c));
             } else {
                 c.sendPacket(PacketCreator.onCashItemGachaponOpenFailed());
             }