feat(武器系统): 新增可蓄力钢管武器及相关功能

实现钢管武器的蓄力攻击机制，包括：
- 添加 Pipe 武器和 PipeBullet 子弹脚本及场景
- 在 Weapon 类中增加蓄力相关属性和方法
- 修改 Rooster 角色以支持武器蓄力功能
- 添加武器蓄力时间计算和伤害加成逻辑

scripts/Contents/Weapons/Pipe.gd

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+@tool
+extends Weapon
+
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 2 * to * soulLevel
+	origin["charge"] += 0.02 * to * soulLevel
+	return origin
+func attack(entity: EntityBase):
+	var weaponPos = entity.findWeaponAnchor("normal")
+	for bullet in BulletBase.generate(
+			ComponentManager.getBullet("Pipe"),
+			entity,
+			weaponPos,
+			weaponPos.angle_to_point(get_global_mouse_position())
+		):
+		if bullet is PipeBullet:
+			var e = charged(readStore("atk"), readStore("charge"))
+			bullet.baseDamage = e
+			bullet.energy = e
+			bullet.speed = e
+	return true

scripts/Contents/Weapons/Pipe.gd.uid

@@ -0,0 +1 @@
+uid://l1v3boq8ei12