Converted individual sidestore command cogs into functions and grouped them under a new Sidestore GroupCog in cogs/sidestore/__init__.py. Updated bot.py and help.py to recognize the new 'sidestore' category. This simplifies command registration and improves maintainability.
Added graceful shutdown support via signals in bot.py, improved shutdown command to use SIGTERM, and enhanced logging for shutdown events. Updated UDID command description for clarity.
