Read NPC building owners once instead of per building at boot

Building.runAfterLoad ran GET_UID_ENUM for every building (~47k queries).
One query now reads the NPC owner IDs before the building load; runtime
loads also check the NPC cache. City load reads ownerIsNPC before NPCs
are cached, so a pass after the NPC load would not work.

Value changes: none. ownerIsNPC is still true exactly when the owner's
object.type is 'npc' (dev DB: 388 buildings, 24 owners).

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

src/engine/objects/Building.java

@@ -1027,15 +1027,10 @@ public class Building extends AbstractWorldObject {
             }
         }
 
-        // Submit upgrade job if building is currently set to rank.
+        // City load reads ownerIsNPC before NPCs are cached, so boot uses the owner set read ahead of buildings.
 
-        try {
-            DbObjectType objectType = DbManager.BuildingQueries.GET_UID_ENUM(this.ownerUUID);
-            this.ownerIsNPC = (objectType == DbObjectType.NPC);
-        } catch (Exception e) {
-            this.ownerIsNPC = false;
-            Logger.error("Failed to find Object Type for owner " + this.ownerUUID + " Location " + this.getLoc().toString());
-        }
+        this.ownerIsNPC = BuildingManager._npcBuildingOwners.contains(this.ownerUUID)
+                || DbManager.inCache(GameObjectType.NPC, this.ownerUUID);
 
         // Reference friend and condemn lists from BuildingManager