feat(子弹效果): 添加HXD子弹爆炸效果及资源

添加HXDBoom效果控制器和5种爆炸纹理
调整HXD子弹的缩放比例并添加爆炸效果触发
扩展EffectController基类以支持自定义注册逻辑

scripts/Statemachine/EffectController.gd

@@ -10,6 +10,7 @@ class_name EffectController
 @onready var animator: AnimationPlayer = $"%animator"
 
 func _ready():
+	register()
 	particles.emitting = false
 	particles.one_shot = oneShot
 	var sound = sounds.get_node_or_null(spawnSound)
@@ -30,6 +31,9 @@ func shot():
 				await sound.finished
 		queue_free()
 
+func register():
+	pass
+
 static func create(scene: PackedScene, spawnPosition: Vector2, parent: Node = null) -> EffectController:
 	var cloned = scene.instantiate() as EffectController
 	cloned.global_position = spawnPosition