Final: Restore /myusage, remove /upgrade and all plan-related codes

Fix: Caption feature conflicts and command prefix

UI: Remove redundant Stats emoji & Fix: New user logging

Fix: UserNotParticipant crash & Update: Public Stats + New Premium Emoji IDs

Fix: TypeError in admin check (int is not iterable)

UI: Enable Force Sub and add Admin Stats button

Refactor: Restructure project folders into admin, user, and rename categories