fix: 统一子弹伤害属性设置并添加类型检查

修改多个武器和召唤物的攻击逻辑，将直接设置damage属性改为设置baseDamage属性
添加BulletBase类型检查确保安全访问子弹属性
移除Weapon.gd中冗余的鼠标事件连接

scripts/Contents/Weapons/PurpleCrystal.gd

@@ -8,5 +8,6 @@ func update(to: int, origin: Dictionary, _entity: EntityBase):
 func attack(entity: EntityBase):
 	var weaponPos = entity.findWeaponAnchor("normal")
 	for bullet in BulletBase.generate(ComponentManager.getBullet("PurpleCrystal"), entity, weaponPos, (get_global_mouse_position() - weaponPos).angle()):
-		bullet.damage = readStore("atk")
+		if bullet is BulletBase:
+			bullet.baseDamage = readStore("atk")
 	return true