- Add new slot machine themes: Pharaoh's Fortune and Abyssal Treasures
- 10 symbols each with corresponding PNG assets
- Cabinet artwork for both themes
- Update slots-artwork.json with image paths for all new symbols
- Reformat registerGame calls in registry.js for consistency
- Update slots iconFrame from 54 to 63
Adds complete artwork and configuration for two new slot machine themes,
bringing the total registered games to 63.
