Create a Minecraft plugin for Paper / Spigot 1.21.x called RadiusKit. Concept: Server operators (OP only) can create kits and give them to players within a customizable radius. Features: * OP players can create kits using their current inventory. * OP players can set a custom radius (example: 10 blocks). * When the command `/radiuskit <kitname>` is executed, all players inside the radius from the command sender will receive the kit. * Kits must be saved so they remain after server restart. * Multiple kits must be supported. Commands: /radiuskit create <kitname> Save the player's current inventory as a kit. /radiuskit delete <kitname> Delete an existing kit. /radiuskit list Show all saved kits. /radiuskit radius <number> Set the radius distance in blocks. /radiuskit <kitname> Give the kit to all players inside the set radius around the command sender. Requirements: * Only OP players can use the commands. * Written in Java using Paper API. * Compatible with Minecraft Paper 1.21.x. * Kits should be stored in config.yml. * Include plugin.yml. * Send messages when a kit is created, deleted, or given. * Provide full plugin source code and file structure. Example: If the radius is set to 10 blocks and there are 4 players within that radius, running `/radiuskit pvp` should give the pvp kit to all 4 players.