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/net/client/msg/ManageNPCMsg.java

@@ -424,7 +424,7 @@ public class ManageNPCMsg extends ClientNetMsg {
                             writer.put((byte) 1);
                             writer.putInt(0);
                             writer.putInt(templateID); //itemID
-                            writer.putInt(template.item_value);
+                            writer.putInt(template.cacheTemplate.getItemValue());
                             writer.putInt(600);
                             writer.put((byte) 1);
                             writer.put((byte) template.modTable);
@@ -444,7 +444,7 @@ public class ManageNPCMsg extends ClientNetMsg {
 
                             writer.putInt(0);
                             writer.putInt(item.templateID);
-                            writer.putInt(item.template.item_value);
+                            writer.putInt(item.template.cacheTemplate.getItemValue());
 
                             long timeLife = item.getDateToUpgrade() - System.currentTimeMillis();