Version 1.2.3 - Shard Transfer, Leaderboard, and Daily Rewards

Features:
- Added Shard Transfer system for player-to-player economy
- Added GUI Leaderboard with pagination and player head display
- Added Daily Rewards system with automatic login bonuses
- Added Streak Multiplier system (Easy/Mid/Hard modes)
- Added configurable message system (100+ message keys)

Changes:
- Transfer command with confirmation dialog
- Leaderboard displays rank, player name, and shard amount
- 7 players per page with navigation buttons
- Daily rewards track consecutive logins and reset on missed days
- All messages customizable via messages.yml

New Commands:
- /transfer <player> <amount> - Transfer shards to player
- /leaderboard [page] - View leaderboard with pagination

Technical Updates:
- Added TransferCommand and TransferListener
- Added LeaderboardManager with database queries
- Added LeaderboardCommand and LeaderboardListener
- Added DailyRewardManager with streak tracking
- Added StreakData class for player streak information
- Implemented GUI pagination system
- Enhanced database queries for leaderboard sorting
- Updated version to 1.2.3