fix: handle NPC facing-only rotation in SMSG_MONSTER_MOVE

Fix bug where NPCs receiving moveType=4 (FacingAngle) or moveType=3
(FacingTarget) monster move packets with zero waypoints would not
rotate in place. The handler only processed orientation when hasDest
was true, but facing-only updates have no destination waypoints.

Now NPCs properly rotate when:
- moveType=4: server specifies an exact facing angle (e.g., NPC turns
  to face the player during dialogue or scripted events)
- moveType=3: NPC should face a specific target entity

This fixes NPCs appearing frozen/unresponsive during scripted events,
quest interactions, and patrol waypoint facing changes.

src/game/game_handler.cpp

@@ -18364,6 +18364,27 @@ void GameHandler::handleMonsterMove(network::Packet& packet) {
             creatureMoveCallback_(data.guid,
                 posCanonical.x, posCanonical.y, posCanonical.z, 0);
         }
+    } else if (data.moveType == 4) {
+        // FacingAngle without movement — rotate NPC in place
+        float orientation = core::coords::serverToCanonicalYaw(data.facingAngle);
+        glm::vec3 posCanonical = core::coords::serverToCanonical(
+            glm::vec3(data.x, data.y, data.z));
+        entity->setPosition(posCanonical.x, posCanonical.y, posCanonical.z, orientation);
+        if (creatureMoveCallback_) {
+            creatureMoveCallback_(data.guid,
+                posCanonical.x, posCanonical.y, posCanonical.z, 0);
+        }
+    } else if (data.moveType == 3 && data.facingTarget != 0) {
+        // FacingTarget without movement — rotate NPC to face a target
+        auto target = entityManager.getEntity(data.facingTarget);
+        if (target) {
+            float dx = target->getX() - entity->getX();
+            float dy = target->getY() - entity->getY();
+            if (std::abs(dx) > 0.01f || std::abs(dy) > 0.01f) {
+                float orientation = std::atan2(-dy, dx);
+                entity->setOrientation(orientation);
+            }
+        }
     }
 }