##########
새 기능
Periodic Leaderboards
- Periodic Leaderboards — Track stats across Daily, Weekly, and Monthly time periods on both global and server leaderboards
- Use /leaderboard server period:Today or click the period buttons to switch between Today, This Week, This Month, and All Time
- All stats supported — Cases opened, items sold, earnings, coinflips, battles, gambling PnL, upgrades, trades, gifts, and more
- Delta rankings for point-in-time stats — See who gained the most Net Worth, Balance, Levels, or Referrals this period
- Counters reset automatically: daily at midnight UTC, weekly on Monday, monthly on the 1st