feat(角色): 添加熊boss的新攻击方式和音效

添加熊boss的四种攻击方式：
1. 箭雨攻击(ArrowSeven)
2. 太阳舞攻击(SunDance)
3. 永恒彩虹攻击(ForeverRainbow)
4. 冲刺攻击(BearSprint)

新增对应攻击音效资源
调整子弹追踪和伤害计算逻辑
添加冲刺粒子特效

scripts/Contents/Bullets/ChickSprint.gd

@@ -5,10 +5,10 @@ func register():
 	speed = 0
 	penerate = 1
 func ai():
-	damage = launcher.velocity.length()
+	damage = launcher.velocity.length() / 300
 	PresetBulletAI.lockLauncher(self, launcher, true)
 	if !launcher.sprinting:
 		tryDestroy()
 func destroy(beacuseMap: bool):
 	if beacuseMap:
-		launcher.takeDamage(self, 0.5)
+		launcher.takeDamage(self, MathTool.rate(0.5))