Level commands

The level system tracks message activity without reading message content. Bots, webhooks, and Discord system messages do not earn XP.

Command	Purpose
/level [user]	Shows XP, level, progress, rank, and message count.
/level-leaderboard	Opens the paginated server ranking.
/level-roles	Lists level reward roles with button pagination for long lists.
/level-role-add role level	Connects a reward role to a level.
/level-role-remove level	Removes a reward mapping without stripping roles already earned.

Fieldbot needs Manage Roles and must sit above each reward role.