Freeze gameobject M2 animations to prevent cycling

Gameobject M2 instances (books, crates, chests) were continuously
cycling their animations because M2Renderer unconditionally loops
all sequences. Added setInstanceAnimationFrozen() and freeze all
gameobject instances at creation time so they stay in their bind pose.

src/core/application.cpp

@@ -5730,6 +5730,9 @@ void Application::spawnOnlineGameObject(uint64_t guid, uint32_t entry, uint32_t
             return;
         }
 
+        // Freeze animation — gameobjects are static until interacted with
+        m2Renderer->setInstanceAnimationFrozen(instanceId, true);
+
         gameObjectInstances_[guid] = {modelId, instanceId, false};
     }