- Add level-based magazine system (3 mags at L1, 2 at L3-5, 1 at L6-8)
- Replace ammo/chargers with current_ammo/magazines/bullets_per_magazine
- Add inventory system for storing and using shop items
- Add Magazine item to shop (15 XP, adds 1 magazine)
- Auto-migrate existing players from old ammo system
- Auto-update magazines when players level up
- Fix method name bugs (get_player_level -> calculate_player_level)
- Added configurable shop system with shop.json
- Created ShopManager class for modular shop handling
- Implemented level system with levels.json for difficulty scaling
- Added multiple duck spawn messages with random selection
- Enhanced message system with color placeholders
- Added ducks_befriended tracking separate from ducks_shot
- Updated help system and admin commands
- All systems tested and working correctly
