refactor(Volcano bullet): 优化火山弹相关逻辑

1. 新增spawn方法并设置可切割属性
2. 调整命中时的冲量大小从500改为400
3. 为动画添加hitbox显隐切换轨道

scripts/Contents/Bullets/Volcano.gd

@@ -9,6 +9,8 @@ var count: int = 0
 var dmg5: float = 0
 var splitAngle: float = 10
 
+func spawn():
+	setupCuttable(0.2)
 func ai():
 	PresetBulletAI.lockLauncher(self , launcher, true)
 	rotation = lerp_angle(
@@ -17,7 +19,7 @@ func ai():
 		rotates
 	)
 func succeedToHit(_dmg: float, entity: EntityBase):
-	entity.impluse((entity.getTrackingAnchor() - position).normalized() * 500)
+	entity.impluse((entity.getTrackingAnchor() - position).normalized() * 400)
 	ParryEntityEffect.createEffectEntity(entity, self )
 
 func generateShadow():