Item Upgrader — Version 1.5.17

- Enabled all 161 previously offer-only catalog items as selectable rewards.
- All 279 catalog items are now available as rewards, including obsidian, stone, cobblestone, dirt, wood and village workstations.
- Preserved existing item values and the probability formula.
- Preserved the UI, quantity controls, animations and player data.
- Shared UI definitions remain identical to Chest Upgrade 0.2.7. No new Chest Upgrade update is required.

Validation: catalog coverage, unchanged values and IDs, JSON parsing, script syntax and archive integrity checked. In-game validation is still required.
