fix(equipment): 기본 무기에 attackSpeed 추가

- bareHands 무기에 attackSpeed: 1000 기본값 설정

lib/src/core/model/equipment_item.dart

@@ -66,7 +66,7 @@ class EquipmentItem {
       slot: EquipmentSlot.weapon,
       level: 1,
       weight: 5,
-      stats: ItemStats(atk: 1),
+      stats: ItemStats(atk: 1, attackSpeed: 1000),
       rarity: ItemRarity.common,
     );
   }