Item Upgrader 1.5.28 VV

Added
- Empty Bucket (offer and reward).
- Water Bucket (offer and reward).
- Lava Bucket (offer and reward).
- Milk Bucket (offer and reward).
- Powder Snow Bucket (offer and reward).
- Shield (offer and reward).
- Saddle (offer and reward).
- Oak Boat (offer and reward).
- Spruce Boat (offer and reward).
- Birch Boat (offer and reward).
- Jungle Boat (offer and reward).
- Acacia Boat (offer and reward).
- Dark Oak Boat (offer and reward).
- Mangrove Boat (offer and reward).
- Cherry Boat (offer and reward).
- Pale Oak Boat (offer and reward).

Catalog: 308 -> 324 items.

Interface and translations
- Added item names and search aliases in Brazilian Portuguese, English and Spanish.
- Buckets, boats and saddle use vanilla texture references.
- Added a dedicated pixel shield icon for the selection and offer/reward interface.

Preserved
- Existing item values, probabilities, roulette, quantity controls and upgrade logic.
- Existing pack UUIDs and item IDs.
- PBR capability and minimum engine requirements from 1.5.27 VV.
- Shared UI definitions used with Chest Upgrade.

Validation
- Checked JSON, JavaScript syntax, duplicate IDs, translations and archive integrity.
- In-game testing on PC, mobile and console remains pending.
- Existing equipment valuation behavior is unchanged, including damaged equipment.
