feat(子弹): 新增狐狸爪子弹及其相关功能

添加FoxZhua子弹类型，包含追踪功能
修改FireScan子弹伤害计算方式为基于距离百分比
扩展BulletBase添加原始伤害和距离计算功能
更新Chick角色使用新子弹和调整攻击逻辑
调整Wave生成逻辑添加Boss检测功能
优化FirePot粒子效果和参数

scripts/Contents/Bullets/FireScan.gd

@@ -1,9 +1,6 @@
 extends BulletBase
 class_name FireScan
 
-func register():
-	speed = 10
-	damage = 20
-
 func ai():
 	PresetBulletAI.forward(self, rotation)
+	damage = (1 - lifeDistancePercent()) * originalDamage

scripts/Contents/Bullets/FoxZhua.gd

@@ -0,0 +1,7 @@
+extends BulletBase
+
+@export var canTrace: bool = true
+
+func ai():
+	if canTrace:
+		PresetBulletAI.lerpPosition(self, launcher.currentFocusedBoss.getTrackingAnchor() - Vector2(0, 200), 0.1)

scripts/Contents/Bullets/FoxZhua.gd.uid

@@ -0,0 +1 @@
+uid://e2doeocb745a