【引擎触发】寄售行：离线寄售与委托购买的引擎实现

local LIST_FEE = 0.02
function QF.ConsignItem(plr, slot, price, days)
    local item = plr.bag[slot]
    if not item or item.bind then return false, "绑定物品不可寄售" end
    local fee = math.ceil(price * LIST_FEE * days)
    if not plr:TakeGold(fee) then return false, "手续费不足" end
    plr.bag[slot] = nil
    consignBoard[#consignBoard + 1] = {
        seller = plr.id, item = item, price = price,
        expireAt = os.time() + days * 86400,
    }
    return true
end

function QF.BuyOrder(plr, itemName, price, count)
    local fee = math.ceil(price * count * 0.01)
    if not plr:TakeGold(price * count + fee) then return false, "委托金不足" end
    buyOrders[#buyOrders + 1] = {
        buyer = plr.id, item = itemName, price = price,
        remain = count, expireAt = os.time() + 3 * 86400,
    }
    return true
end

function QF.SellToOrder(plr, slot, orderIdx)
    local order = buyOrders[orderIdx]
    local item = plr.bag[slot]
    if not item or item.name ~= order.item then return false, "物品不符" end
    plr:AddGold(order.price)
    QF_MailGold(order.buyer, 0)
    plr.bag[slot] = nil
    order.remain = order.remain - 1
    QF_DeliverItem(order.buyer, item)
    return true
end