- Added on_message event that strips leading '!' and passes to process_commands()
- Added !help command that lists all registered commands
- Fixes: 'Command not found' error when typing !help or any ! command
- Now supports both slash commands (/ping) and prefix commands (!ping)
- Added APP_DEBUG environment variable to enable debug mode
- Debug mode prints detailed logs to console and file (bot.log)
- Debug mode includes Discord library internals (discord, discord.ext.commands, etc.)
- File handler rotates at 10MB, keeping 5 backup files
- Console handler only active when DEBUG is enabled
- Default logging level is WARNING (non-debug) to reduce noise
- /edit-emoji now uses alias 'edit' only
- /rename now uses alias 'rename-emoji' only
- Fixes: 'The command rename is already an existing command or alias' error
