Better License Control and Easier Setup

This update, v3.0.3, brings a complete upgrade to license management. I've added new commands: /license-managers to control which roles can create licenses, and /license-history to track every license action (creation, use, expiration) with filters and paging. All these events are now saved in the database. I've also improved the license-list command with more filter options. Finally, I've made the bot easier to deploy by simplifying the command setup process and cleaning up some old code.