Dino's Shop 0.2.0 Beta

- Rebuilt against the exact Minecraft 26.1.2 / NeoForge 26.1.2.76 runtime classes.
- Added /shop marketplace GUI.
- Added /sell <price>, /balance, and /market cancel <listing>.
- Added persistent balances and listings saved in the world folder.
- Removed all old compatibility shims that caused runtime crashes.
