feat(武器): 添加火山武器及其子弹逻辑

实现火山武器系统，包括：
1. 添加火山武器场景和脚本，支持旋转子弹和伤害计算
2. 新增子弹自旋转AI预设
3. 为公鸡角色添加火山武器配置
4. 实现武器升级效果随灵魂等级提升

scripts/Contents/Weapons/Volcano.gd

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+@tool
+extends Weapon
+
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 5 * to * soulLevel
+	origin["count"] += 1 * soulLevel
+	origin["rotate"] += 0.25 * to * soulLevel
+	return origin
+func attack(entity: EntityBase):
+	for i in readStore("count"):
+		for j in BulletBase.generate(ComponentManager.getBullet("Volcano"), entity, entity.findWeaponAnchor("normal"), deg_to_rad(360.0 / readStore("count") * i)):
+			var bullet: Volcano = j
+			bullet.damage = readStore("atk")
+			bullet.rotates = readStore("rotate")

scripts/Contents/Weapons/Volcano.gd.uid

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+uid://cbihum34xs8ev