feat: 调整角色和子弹属性及游戏平衡

- 隐藏Bear角色的mask
- 提高Bear和KukeMC子弹的伤害值
- 增加KukeMC的最大生命值
- 设置World场景的currentInvinsible为true
- 调整KukeChild的攻击冷却时间和存活时间
- 为HeavyCrystal子弹添加初始伤害值

scripts/Contents/Characters/KukeChild.gd

@@ -6,12 +6,12 @@ func register():
 	fields[FieldStore.Entity.MAX_HEALTH] = 25
 	fields[FieldStore.Entity.MOVEMENT_SPEED] = 0.35
 	attackCooldownMap[0] = 200
-	attackCooldownMap[1] = 3500
+	attackCooldownMap[1] = 4000
 func ai():
 	PresetEntityAI.follow(self, currentFocusedBoss, 700)
 	tryAttack(0)
 	tryAttack(1)
-	if timeLived() > 8000:
+	if timeLived() > 10000:
 		masterMine.tryHeal(100)
 		tryDie(null)
 func attack(type):