fix(D-01/C): missing sync + worldgen empty registry race (review)

StruggleSessionManager: add V2EquipmentHelper.sync(player) after bind
resistance update to prevent data loss on server restart during struggle

HangingCagePiece: add fallback ResourceLocation arrays for worldgen when
DataDrivenItemRegistry is empty (race with reload listener on initial
world creation). Registry-first with hardcoded fallbacks.

src/main/java/com/tiedup/remake/minigame/StruggleSessionManager.java

@@ -647,6 +647,7 @@ public class StruggleSessionManager {
         }
         if (bindStack.getItem() instanceof IHasResistance resistanceItem) {
             resistanceItem.setCurrentResistance(bindStack, session.getCurrentResistance());
+            V2EquipmentHelper.sync(player);
         }
     }