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/Statemachine/BulletBase.gd

@@ -30,9 +30,11 @@ var destroying: bool = false
 var isChildSplit: bool = false
 var isChildRefract: bool = false
 var initialSpeed: float = 0
+var originalDamage: float = 0
 
 func _ready():
 	initialSpeed = speed
+	originalDamage = damage
 	if launcher.isSummon():
 		launcherSummoned = launcher
 		launcher = launcher.myMaster
@@ -99,6 +101,10 @@ func fullPenerate():
 	return penerate + launcher.fields.get(FieldStore.Entity.PENERATE) + GameRule.penerateRateInfluenceByLuckValue * launcher.fields[FieldStore.Entity.LUCK_VALUE]
 func timeLived():
 	return WorldManager.getTime() - spawnInWhen
+func distanceLived():
+	return position.distance_to(spawnInWhere)
+func lifeDistancePercent():
+	return distanceLived() / lifeDistance
 func dotLoop():
 	if await applyDot():
 		await TickTool.until(func(): return !UIState.currentPanel)