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

components/Bullets/Volcano.tscn

@@ -67,6 +67,18 @@ tracks/4/keys = {
 "update": 1,
 "values": [0]
 }
+tracks/5/type = "value"
+tracks/5/imported = false
+tracks/5/enabled = true
+tracks/5/path = NodePath("%hitbox:disabled")
+tracks/5/interp = 1
+tracks/5/loop_wrap = true
+tracks/5/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [false]
+}
 
 [sub_resource type="Animation" id="Animation_oinqg"]
 resource_name = "destroy"
@@ -175,6 +187,18 @@ tracks/6/keys = {
 "update": 1,
 "values": [6, 0, 6]
 }
+tracks/7/type = "value"
+tracks/7/imported = false
+tracks/7/enabled = true
+tracks/7/path = NodePath("%hitbox:disabled")
+tracks/7/interp = 1
+tracks/7/loop_wrap = true
+tracks/7/keys = {
+"times": PackedFloat32Array(0, 0.05, 0.2, 0.7, 0.9, 1.2, 1.35, 1.65, 1.8),
+"transitions": PackedFloat32Array(1, 1, 1, 1, 1, 1, 1, 1, 1),
+"update": 1,
+"values": [true, false, true, false, true, false, true, false, true]
+}
 
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_w1utg"]
 _data = {