fix(武器): 调整火山武器计数和旋转速度计算方式

修改ChainGun、Meowmere和Volcano武器的count计算逻辑，从soulLevel改为(soulLevel - 1)
调整Volcano武器的旋转速度从0.25降至0.1，并添加生命周期参数
为Volcano子弹添加粒子特效和动画效果
更新武器描述文本以反映新的生命周期参数

scripts/Contents/Weapons/ChainGun.gd

@@ -3,7 +3,7 @@ extends Weapon
 
 func update(to, origin, _entity):
 	origin["atk"] += 2 * to * soulLevel
-	origin["count"] = 1 * soulLevel
+	origin["count"] = 1 * (soulLevel - 1)
 	origin["split"] /= 1 + 0.05 * to * soulLevel
 	return origin
 func attack(entity: EntityBase):

scripts/Contents/Weapons/Meowmere.gd

@@ -3,7 +3,7 @@ extends Weapon
 
 func update(to, origin, _entity):
 	origin["atk"] += 3 * to * soulLevel
-	origin["count"] = 1 * soulLevel
+	origin["count"] = 1 * (soulLevel - 1)
 	origin["childatk"] += 1.25 * origin["atk"]
 	origin["reduce"] /= 1 + 0.05 * to * soulLevel
 	return origin

scripts/Contents/Weapons/Volcano.gd

@@ -3,8 +3,9 @@ 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
+	origin["count"] += 1 * (soulLevel - 1)
+	origin["rotate"] += 0.1 * to * soulLevel
+	origin["life"] += 0.05 * to * soulLevel
 	return origin
 func attack(entity: EntityBase):
 	for i in readStore("count"):
@@ -12,3 +13,4 @@ func attack(entity: EntityBase):
 			var bullet: Volcano = j
 			bullet.damage = readStore("atk")
 			bullet.rotates = readStore("rotate")
+			bullet.lifeTime = readStore("life") * 1000