feat(D-01/E): resistance & lock system rework (E1-E7)

E1: Initialize currentResistance in NBT at equip time from
    ResistanceComponent — eliminates MAX-scan fallback bug

E2: BuiltInLockComponent for organic items (already committed)

E3: canStruggle refactor — new model:
    - ARMS: always struggle-able (no lock gating)
    - Non-ARMS: only if locked OR built-in lock
    - Removed dead isItemLocked() from StruggleState + overrides

E4: canUnequip already handled by BuiltInLockComponent.blocksUnequip()
    via ComponentHolder delegation

E5: Help/assist mechanic deferred (needs UI design)

E6: Removed lock resistance from ILockable (5 methods + NBT key deleted)
    - GenericKnife: new knifeCutProgress NBT for cutting locks
    - StruggleAccessory: accessoryStruggleResistance NBT replaces lock resistance
    - PacketV2StruggleStart: uses config-based padlock resistance
    - All lock/unlock packets cleaned of initializeLockResistance/clearLockResistance

E7: Fixed 3 pre-existing bugs:
    - B2: DataDrivenItemRegistry.clear() synchronized on RELOAD_LOCK
    - B3: V2TyingPlayerTask validates heldStack before equip (prevents duplication)
    - B5: EntityKidnapperMerchant.remove() cleans playerToMerchant map (memory leak)

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

@@ -622,18 +622,14 @@ public class StruggleSessionManager {
             );
             if (accessoryStack.isEmpty()) return;
 
-            if (
-                accessoryStack.getItem() instanceof
-                    com.tiedup.remake.items.base.ILockable lockable
-            ) {
-                // Update the lock resistance to match session state
-                lockable.setCurrentLockResistance(
-                    accessoryStack,
-                    session.getCurrentResistance()
-                );
-                // Sync V2 equipment state
-                V2EquipmentHelper.sync(player);
-            }
+            // Update accessory struggle resistance in dedicated NBT key
+            com.tiedup.remake.util.ItemNBTHelper.setInt(
+                accessoryStack,
+                "accessoryStruggleResistance",
+                session.getCurrentResistance()
+            );
+            // Sync V2 equipment state
+            V2EquipmentHelper.sync(player);
             return;
         }