Update data version and add new chess event

src/main/java/emu/nebula/GameConstants.java

@@ -6,7 +6,7 @@ import emu.nebula.game.inventory.ItemParam;
 import emu.nebula.util.WeightedList;
 
 public class GameConstants {
-    public static final String VERSION = "1.4.0";
+    public static final String VERSION = "1.5.0";
     public static int DATA_VERSION = 0;
     
     public static final ZoneId UTC_ZONE = ZoneId.of("UTC");

src/main/java/emu/nebula/game/activity/ActivityModule.java

@@ -41,7 +41,7 @@ public class ActivityModule extends GameContextModule {
         this.activities.add(700110);
 
         // Tower defense activity
-        this.activities.add(102001);
+        this.activities.add(102002);
         
         // Christmas 2025 login events
         this.activities.add(301011);