Check charters through DeedTemplate

GuildCreationFinalizeHandler and UseCharterMsg now match charters by
DeedTemplate._deeds instead of the shared item_type getter, like the
other deed paths.

Value change: template 545 "Charter" (ITEM folder, CHARTER) no longer
counts as a charter. It is a base template that players can't get: its
only DB reference is static_vendor_items with vendorType 0, it has no
loot rows, and it is not in GuildCharterType.templateLookup, so guild
creation already rejected it.

JSON-Refactor-Plan Task 1.3.

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

src/engine/net/client/msg/UseCharterMsg.java

@@ -16,6 +16,7 @@ import engine.net.ByteBufferWriter;
 import engine.net.Protocol;
 import engine.objects.Item;
 import engine.objects.PlayerCharacter;
+import engine.parsers.objects.DeedTemplate;
 
 
 public class UseCharterMsg extends ClientNetMsg {
@@ -61,9 +62,13 @@ public class UseCharterMsg extends ClientNetMsg {
 
     public void configure() {
 
+        DeedTemplate charterDeed;
+
         if (close) {
             for (Item i : player.getInventory()) {
-                if (i.template.cacheTemplate.getItemType().equals(ItemType.CHARTER)) {
+                charterDeed = DeedTemplate._deeds.get(i.templateID);
+
+                if (charterDeed != null && charterDeed.item_type.equals(ItemType.CHARTER)) {
                     charterUUID = i.getObjectUUID();
                     break;
                 }