refactor(武器系统): 重构火山武器和火扫弹攻击机制

移除火扫弹的独立脚本和火罐效果，改为直接在子弹中实现
火山武器改为三段伤害机制并调整基础伤害值
添加子弹基础伤害乘数数组支持多段伤害
更新相关场景和资源配置以匹配新机制

scripts/Contents/Bullets/FireScan.gd

@@ -1,6 +0,0 @@
-extends BulletBase
-class_name FireScan
-
-func ai():
-	PresetBulletAI.forward(self, rotation)
-	damage = (1 - lifeDistancePercent()) * originalDamage

scripts/Contents/Bullets/FireScan.gd.uid

@@ -1 +0,0 @@
-uid://dlg4g03ppdd2x

scripts/Contents/Bullets/FoxZhua.gd

@@ -5,4 +5,4 @@ class_name FoxZhua
 
 func ai():
 	if canTrace:
-		PresetBulletAI.lerpPosition(self, launcher.currentFocusedBoss.getTrackingAnchor() - Vector2(0, 200), speed)
+		PresetBulletAI.lerpPosition(self, launcher.currentFocusedBoss.getTrackingAnchor() - Vector2(0, 200), speed)