Add transport support, gameobject queries, and fix item use

- Add setInstancePosition() to M2Renderer and WMORenderer for moving
  transport instances at runtime
- Detect UPDATEFLAG_TRANSPORT on gameobjects and track transport GUIDs
- Parse player-on-transport state from movement blocks
- Wire transport move callback in Application to update render positions
- Implement CMSG_GAMEOBJECT_QUERY / SMSG_GAMEOBJECT_QUERY_RESPONSE so
  gameobjects display proper names instead of "Unknown"
- Add name/entry fields to GameObject entity class
- Fix CMSG_USE_ITEM packet: remove extra uint8 that shifted the item
  GUID by one byte, breaking hearthstone and all item usage
- Remove redundant CMSG_LOOT after CMSG_GAMEOBJECT_USE for chests
- Show PvP enabled/disabled state in toggle message
- Relax WMO ramp wall-collision step-up check to allow walking on
  gentle ramps where floor rise per step is under 0.1 units
- Add M2 fallback when WMO group files fail to load for gameobjects
- Handle re-creation of existing gameobject render instances by
  updating position instead of silently ignoring

src/rendering/m2_renderer.cpp

@@ -2148,6 +2148,21 @@ void M2Renderer::renderSmokeParticles(const Camera& /*camera*/, const glm::mat4&
     glEnable(GL_CULL_FACE);
 }
 
+void M2Renderer::setInstancePosition(uint32_t instanceId, const glm::vec3& position) {
+    auto idxIt = instanceIndexById.find(instanceId);
+    if (idxIt == instanceIndexById.end()) return;
+    auto& inst = instances[idxIt->second];
+    inst.position = position;
+    inst.updateModelMatrix();
+    auto modelIt = models.find(inst.modelId);
+    if (modelIt != models.end()) {
+        glm::vec3 localMin, localMax;
+        getTightCollisionBounds(modelIt->second, localMin, localMax);
+        transformAABB(inst.modelMatrix, localMin, localMax, inst.worldBoundsMin, inst.worldBoundsMax);
+    }
+    rebuildSpatialIndex();
+}
+
 void M2Renderer::removeInstance(uint32_t instanceId) {
     for (auto it = instances.begin(); it != instances.end(); ++it) {
         if (it->id == instanceId) {