Add support plugin ShowItem

https://www.spigotmc.org/resources/showitem.10133/

%addhead_head% - placeholder don't work

When I show an item in the chat, I want the player's nickname to be preceded by his head, but this cannot be done because the placeholder is not supported.

<img width="1654" height="251" alt="Image" src="https://github.com/user-attachments/assets/bd1f0aec-3a1c-47c4-91a2-ffdcf0475010" />