refactor(Bullet): 移除ChickSprint的atk变量并简化伤害计算

调整Cat角色的攻击冷却时间和冲刺倍数
为BulletBase添加speedScale属性和setupCuttable方法
将Volcano的animator速度设置移至ai方法并应用speedScale

scripts/Contents/Bullets/ChickSprint.gd

@@ -1,13 +1,11 @@
 extends BulletBase
 class_name ChickSprint
 
-var atk: float = 1
-
 func register():
 	speed = 0
 	penerate = 1
 func ai():
-	baseDamage = launcher.velocity.length() / 500.0 * atk
+	baseDamage = launcher.velocity.length() / 500.0
 	PresetBulletAI.lockLauncher(self, launcher, true)
 	if !launcher.sprinting:
 		tryDestroy()

scripts/Contents/Bullets/Volcano.gd

@@ -10,8 +10,9 @@ var dmg5: float = 0
 var splitAngle: float = 10
 
 func register():
-	animator.speed_scale = launcher.fields.get(FieldStore.Entity.ATTACK_SPEED)
+	setupCuttable(0.1)
 func ai():
+	animator.speed_scale = launcher.fields.get(FieldStore.Entity.ATTACK_SPEED) * speedScale
 	PresetBulletAI.lockLauncher(self, launcher, true)
 	rotation = lerp_angle(
 		rotation,