Bridge legacy ItemTemplate to its cache template

Each engine.objects.ItemTemplate gets a cacheTemplate field, filled by
linkCacheTemplates() right after CObjectIndex.build() on both servers,
so consumers can move to CObjectTemplate one field at a time.

ParityCheck gains a static_item_templates comparator: a null bridge is
reported as missing in json, and obj_name and item_type are compared
through the interface to catch a wrong folder pick.

Import convention until the legacy class is removed (Task 1.8): the
legacy engine.objects.ItemTemplate keeps the plain import; the cache
class is always written engine.parsers.objects.ItemTemplate. Migrated
consumers should depend on CObjectTemplate instead.

JSON-Refactor-Plan Task 1.1. No consumers change; no values change.

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

src/engine/objects/ItemTemplate.java

@@ -10,6 +10,7 @@ package engine.objects;
 
 import engine.math.Vector3fImmutable;
 import engine.mbEnums;
+import engine.parsers.objects.CObjectTemplate;
 import org.json.JSONArray;
 import org.json.JSONObject;
 import org.pmw.tinylog.Logger;
@@ -157,6 +158,9 @@ public class ItemTemplate {
     public final ArrayList<Integer> rune_helper_monster_types = new ArrayList<>();
     public int item_bane_rank;
 
+    // Cache JSON counterpart, so consumers can move to the new templates one field at a time.
+    public CObjectTemplate cacheTemplate;
+
     public ItemTemplate(JSONObject jsonObject) {
 
         try {
@@ -646,4 +650,22 @@ public class ItemTemplate {
         }
     }
 
+    // Run after CObjectIndex.build(); the DB templates load before the cache parsers.
+
+    public static void linkCacheTemplates() {
+
+        int missingCount = 0;
+
+        for (ItemTemplate template : templates.values()) {
+            template.cacheTemplate = CObjectTemplate.lookup(template.template_id);
+
+            if (template.cacheTemplate == null) {
+                missingCount++;
+                Logger.warn(template.template_id + ": " + template.obj_name + " has no cache template");
+            }
+        }
+
+        Logger.info("Linked " + (templates.size() - missingCount) + " of " + templates.size() + " item templates to cache templates");
+    }
+
 }