Read item weight, value and base name through the bridge

Consumers of the legacy ItemTemplate item_wt, item_value and
item_base_name now read getItemWt(), getItemValue() and
getItemBaseName() on template.cacheTemplate.

Parity (offline, scripts/p14.py, 7586 templates): 0 differences in
item_wt, item_value and item_base_name. No value changes expected.

JSON-Refactor-Plan Task 1.4.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/objects/Corpse.java

@@ -296,7 +296,7 @@ public class Corpse extends AbstractWorldObject {
 
             //get weight of item
 
-            int weight = item.template.item_wt;
+            int weight = item.template.cacheTemplate.getItemWt();
 
             //make sure looter has room for item
             if (item.template.cacheTemplate.getItemType().equals(ItemType.GOLD) == false && !looterItems.hasRoomInventory(weight))