feat(战斗系统): 添加小鸡冲刺攻击技能及相关特效

实现小鸡的冲刺攻击能力，包括：
1. 新增ChickSprint子弹类型及场景
2. 为EntityBase添加拖尾粒子效果
3. 添加攻击蓄力特效和音效
4. 调整小鸡的攻击冷却时间和冲刺倍率
5. 优化TickTool工具类添加until方法
6. 修改世界背景z-index避免遮挡

调整战斗平衡性：
1. 降低默认冲刺倍率
2. 修改测试波次配置
3. 增加新的攻击方式选项

scripts/Contents/Characters/Chick.gd

@@ -8,9 +8,11 @@ const laserCount = 4
 func register():
 	fields[FieldStore.Entity.MAX_HEALTH] = 2000
 	fields[FieldStore.Entity.MOVEMENT_SPEED] = 0.35
-	attackCooldownMap[0] = 2000
+	attackCooldownMap[0] = 500
 	attackCooldownMap[1] = 6000
 	attackCooldownMap[2] = 100
+	attackCooldownMap[3] = 500
+	sprintMultiplier = 60
 func spawn():
 	texture.play("walk")
 
@@ -21,7 +23,8 @@ func ai():
 	elif currentFocusedBoss.position.distance_to(position) < 700:
 		tryAttack(1)
 	else:
-		tryAttack(0)
+		var method = MathTool.randc_from([0, 3])
+		tryAttack(method, method == 3)
 func attack(type):
 	if type == 0:
 		var weaponPos = findWeaponAnchor("normal")
@@ -36,4 +39,11 @@ func attack(type):
 		firepot.global_rotation = target
 		firepot.shot()
 		BulletBase.generate(preload("res://components/Bullets/FireScan.tscn"), self, weaponPos, target)
+	elif type == 3:
+		trailing = true
+		BulletBase.generate(preload("res://components/Bullets/ChickSprint.tscn"), self, position, 0)
+		await trySprint()
+		trailing = false
 	return true
+func sprint():
+	move((currentFocusedBoss.position - position).normalized() * sprintMultiplier, true)