feat(子弹系统): 重构伤害计算并添加音效

将子弹的伤害属性从`damage`重命名为`baseDamage`，并引入`damageMultipliers`数组支持多段伤害
为火山武器添加三段攻击音效并调整伤害倍率
更新相关武器和子弹脚本以适配新的伤害系统

scripts/Contents/Bullets/ChickSprint.gd

@@ -7,7 +7,7 @@ func register():
 	speed = 0
 	penerate = 1
 func ai():
-	damage = launcher.velocity.length() / 500 * atk
+	baseDamage = launcher.velocity.length() / 500 * atk
 	PresetBulletAI.lockLauncher(self, launcher, true)
 	if !launcher.sprinting:
 		tryDestroy()