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/db/handlers/dbItemHandler.java

@@ -554,7 +554,7 @@ public class dbItemHandler extends dbHandlerBase {
 
         // Write 0 if we will not modify the value from template
 
-        if (value == item.template.item_value)
+        if (value == item.template.cacheTemplate.getItemValue())
             value = 0;
 
         try (Connection connection = DbManager.getConnection();