Create a Minecraft Paper plugin (API version 1.21+) with the following behavior: CORE MECHANIC: - When a player is killed by another player (PvP only), the victim drops their own player head. - If the player dies from any other cause (mob, fall, lava, etc.), nothing happens. HEAD ITEM: - The dropped item must be a PLAYER_HEAD with the correct skin of the dead player. - The head must store the victim’s UUID using PersistentDataContainer and a NamespacedKey. - This tag must uniquely identify the head as a special “HeadBan” head. BAN SYSTEM: - When a player is killed by another player, they are permanently banned (no expiration date). - The ban reason should be: "Banned until your head is placed!" - The player must be kicked immediately after death with a clear message. UNBAN SYSTEM: - When a player places the special head block, the plugin should: 1. Read the UUID stored in the head 2. Find the corresponding player 3. Remove their ban immediately 4. Broadcast a message: "<pla