feat(子弹效果): 为蓝水晶子弹添加爆炸效果并调整相关配置

- 在BlueCrystal.gd中添加destroy方法创建爆炸效果
- 新增BlueCrystalExplosion.tscn爆炸效果场景
- 调整PurpleCrystalExplosion.tscn粒子数量
- 修复ItemDropped.gd中玩家实例有效性检查
- 将Rooster.tscn的武器更换为水晶系武器

components/Effects/PurpleCrystalExplosion.tscn

@@ -75,18 +75,18 @@ tracks/0/keys = {
 
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_n7i5u"]
 _data = {
-"RESET": SubResource("Animation_rcc6g"),
-"explosion": SubResource("Animation_pa4et")
+&"RESET": SubResource("Animation_rcc6g"),
+&"explosion": SubResource("Animation_pa4et")
 }
 
 [node name="Explosion" instance=ExtResource("1_sqdwd")]
 
 [node name="particles" parent="." index="1"]
-amount = 25
-process_material = SubResource("ParticleProcessMaterial_w52ko")
+amount = 10
 lifetime = 0.5
+process_material = SubResource("ParticleProcessMaterial_w52ko")
 
 [node name="animator" parent="stage" index="0"]
 libraries = {
-"": SubResource("AnimationLibrary_n7i5u")
+&"": SubResource("AnimationLibrary_n7i5u")
 }