refactor(Bullets): 移除SevenSoul子弹的spawnedChild变量及相关逻辑

简化子弹生成逻辑，移除不再需要的状态变量和循环生成子子弹的代码

scripts/Contents/Bullets/SevenSoul.gd

@@ -9,7 +9,6 @@ var colors = [
 	"#FDEB0F"
 ]
 var index = 0
-var spawnedChild = false
 
 @onready var heart = $"%heart"
 @onready var effect: GPUParticles2D = $"%effect"
@@ -24,12 +23,6 @@ func ai():
 	PresetBulletAI.lockLauncher(self, launcher, true)
 func applyDot():
 	if timeLived() > 20000 * ((6.0 - index) / 6.0):
-		if !spawnedChild:
-			spawnedChild = true
-			var count = 7
-			for i in count:
-				BulletBase.generate(ComponentManager.getBullet("WhiteSoul"), launcher, heart.global_position, rotation + deg_to_rad(360.0 / count * i))
-				await TickTool.millseconds(50)
 		BulletBase.generate(ComponentManager.getBullet("SoulBall"), launcher, heart.global_position, heart.global_position.angle_to_point(get_global_mouse_position()))
 	await TickTool.millseconds(100)
 	return true