feat(武器系统): 重构链式机枪并添加新武器

- 修改链式机枪的子弹生成逻辑，使用新的锚点系统
- 调整武器属性包括伤害值、冷却时间和能量消耗
- 为公鸡角色添加蘑菇镐和核弹两种新武器
- 优化公鸡角色的攻击输入检测逻辑

scripts/Contents/Weapons/ChainGun.gd

@@ -2,9 +2,8 @@
 extends Weapon
 
 func update(to, origin, _entity):
-	origin["atk"] += 1 * to * soulLevel
+	origin["atk"] += 2 * to * soulLevel
 	return origin
 func attack(entity: EntityBase):
-	var weaponPos = entity.findWeaponAnchor("normal")
-	for i in BulletBase.generate(ComponentManager.getBullet("PurpleCrystalSmall"), entity, weaponPos, (get_global_mouse_position() - weaponPos).angle()):
+	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")