refactor(BulletBase): 移除子弹注册方法并添加子子弹标记

移除所有子弹类中的register方法，将属性初始化移至其他位置
在BulletBase的trySplit和tryRefract方法中添加子子弹标记

scripts/Contents/Bullets/BossAttack/Bear/LightGun.gd

@@ -6,12 +6,8 @@ extends BulletBase
 @onready var track: ShaderStage = $"%track"
 @onready var sword: Sprite2D = $"%sword"
 @onready var points: GPUParticles2D = $"%points"
-
 var myColor: Color
-func register():
-	speed = 1
-	baseDamage = 1
-	penerate = 1
+
 func spawn():
 	myColor = allColor.gradient.sample(randf())
 	track.material = track.material.duplicate()