Wire ambient sound zone detection: setZoneType/setCityType was never called

Add AmbientSoundManager::setZoneId() that maps WoW zone IDs to the
appropriate ZoneType (forest/grasslands/desert/jungle/marsh/beach) or
CityType (Stormwind/Ironforge/Darnassus/Orgrimmar/Undercity/ThunderBluff)
and delegates to setZoneType/setCityType. Call it from the renderer's
zone transition handler so zone ambience (looping sounds, city bells,
etc.) actually activates when the player enters a zone.

src/rendering/renderer.cpp

@@ -3155,6 +3155,10 @@ void Renderer::update(float deltaTime) {
                     }
                 }
             }
+            // Update ambient sound manager zone type
+            if (ambientSoundManager) {
+                ambientSoundManager->setZoneId(zoneId);
+            }
         }
 
         musicManager->update(deltaTime);