feat(武器系统): 新增红水晶武器及相关资源

添加红水晶武器系统，包括武器、子弹、特效和音效资源
- 新增红水晶武器脚本及场景，实现爆炸伤害功能
- 添加红水晶子弹逻辑，支持半径爆炸效果
- 加入红水晶爆炸特效和音效
- 更新角色武器库包含红水晶武器
- 调整现有水晶武器描述和数值
- 扩展子弹基类支持首帧回调
- 更新特效控制器支持音效播放等待

scripts/Statemachine/BulletBase.gd

@@ -36,6 +36,7 @@ var initialSpeed: float = 0
 var initialDamage: float = 0
 var speedScale: float = 1
 var parentScene: PackedScene = null
+var isFirstFrame: bool = true
 
 func _ready():
 	initialSpeed = speed
@@ -85,6 +86,9 @@ func _physics_process(_delta: float) -> void:
 				targetEntity.getTrackingAnchor(),
 				launcher.fields.get(FieldStore.Entity.BULLET_TRACE) / 10
 			)
+		if isFirstFrame:
+			firstFrame()
+			isFirstFrame = false
 		ai()
 	else:
 		tryDestroy()
@@ -122,6 +126,8 @@ func timeLived():
 	return WorldManager.getTime() - spawnInWhen
 func distanceLived():
 	return position.distance_to(spawnInWhere)
+func lifeTimePercent():
+	return timeLived() / lifeTime
 func lifeDistancePercent():
 	return distanceLived() / lifeDistance
 func dotLoop():
@@ -156,6 +162,8 @@ func tryRefract():
 				refract(entity, i, total, last)
 
 # 抽象方法
+func firstFrame():
+	pass
 func ai():
 	pass
 func destroy(_beacuseMap: bool):

scripts/Statemachine/EffectController.gd

@@ -24,6 +24,10 @@ func shot():
 	if oneShot:
 		await cloned.finished
 		cloned.queue_free()
+		if spawnSound:
+			var sound: AudioStreamPlayer2D = sounds.get_node(spawnSound)
+			if sound.playing:
+				await sound.finished
 		queue_free()
 
 static func create(scene: PackedScene, spawnPosition: Vector2, parent: Node2D = null) -> EffectController: