feat(武器): 添加鸡毛弓武器及相关箭矢功能

实现鸡毛弓武器系统，包括武器脚本、箭矢脚本和场景配置
修改实体伤害处理逻辑，分离普通伤害和子弹伤害方法
更新公鸡角色配置，添加鸡毛弓作为默认武器

scripts/Contents/Weapons/Bow.gd

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+@tool
+extends Weapon
+
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 0.05 * to * soulLevel
+	origin["count"] = 1 * soulLevel
+	origin["self"] += 0.1 * to
+	return origin
+func attack(entity: EntityBase):
+	entity.takeDamage(readStore("self"))
+	var weaponPos = entity.findWeaponAnchor("normal")
+	for i in BulletBase.generate(
+			ComponentManager.getBullet("Bow"),
+			entity,
+			weaponPos,
+			weaponPos.angle_to_point(get_global_mouse_position())
+		):
+			var bullet: Bow = i
+			bullet.count = readStore("count")
+			bullet.atk = readStore("atk")

scripts/Contents/Weapons/Bow.gd.uid

@@ -0,0 +1 @@
+uid://1u8t36atj041