feat(子弹系统): 添加QKSword子弹及其处理逻辑

实现QKSword子弹类型，包括子弹行为、生成逻辑和命中效果
- 新增QKSwordBullet类，实现追踪目标功能
- 新增QKSwordHandler处理命中后的子弹生成
- 修改ParryBall使其命中时生成QKSword子弹
- 调整CycleTimer的子弹偏移计算
- 为BulletBase添加afterSpawn回调

scripts/Statemachine/BulletBase.gd

@@ -71,6 +71,7 @@ func _ready():
 	if autoSpawnAnimation:
 		animator.play("spawn")
 		await animator.animation_finished
+		afterSpawn()
 		if freeAfterSpawn:
 			tryDestroy()
 func _process(_delta: float) -> void:
@@ -214,6 +215,8 @@ func destroy(_beacuseMap: bool):
 	pass
 func spawn():
 	pass
+func afterSpawn():
+	pass
 func applyDot():
 	pass
 func succeedToHit(_dmg: float, _entity: EntityBase):

scripts/Statemachine/CycleTimer.gd

@@ -19,7 +19,7 @@ func apply():
 	for index in len(bullets):
 		var bullet = bullets[index]
 		var offset = Vector2.from_angle(periodPercent(index))
-		offset.y *= 0.5
+		offset.y *= 0.25
 		bullet.position = bullet.launcher.position + offset * distance
 		bullet.scale = Vector2.ONE * (1 + offset.y)
 func host(bullet: BulletBase):