fix(武器): 调整Meowmere和ChainGun的伤害计算及属性

修复Meowmere的childatk计算方式，改为基于atk的百分比
修正ChainGun子弹的split属性名称为splits
调整Meowmere的基础伤害值和描述文本
将Rooster的默认武器从ChainGun替换为Meowmere

scripts/Contents/Weapons/ChainGun.gd

@@ -10,4 +10,4 @@ func attack(entity: EntityBase):
 	for i in BulletBase.generate(ComponentManager.getBullet("ChainGun"), entity, entity.texture.global_position, (get_global_mouse_position() - entity.texture.global_position).angle()):
 		i.damage = readStore("atk")
 		i.count = floor(readStore("count"))
-		i.split = readStore("split")
+		i.splits = readStore("split")

scripts/Contents/Weapons/Meowmere.gd

@@ -4,7 +4,7 @@ extends Weapon
 func update(to, origin, _entity):
 	origin["atk"] += 3 * to * soulLevel
 	origin["count"] = 1 * soulLevel
-	origin["childatk"] += 2 * to * soulLevel
+	origin["childatk"] += 1.25 * origin["atk"]
 	origin["reduce"] /= 1 + 0.05 * to * soulLevel
 	return origin
 func attack(entity: EntityBase):