【性能调优】批量请求的合并：同类操作的聚合处理

---批量卖物：一次请求结算多件
function Bulk.sell(actor, items)
    local player = class(actor)
    if not player then return false end
    -- 单次上限 20 件，防超长请求
    if #items > 20 then
        sendmsg(actor, 1, "单次最多卖出 20 件")
        return false
    end
    local earned, sold = 0, 0
    for _, idx in ipairs(items) do
        local item = Bulk.locate(actor, idx)
        if item and Bulk.sellable(item) then
            earned = earned + Bulk.priceOf(item)
            delitembymakeindex(actor, idx)
            sold = sold + 1
        end
    end
    if sold > 0 then
        giveitem(actor, "金币", earned)
        sendmsg(actor, 1, "售出 " .. sold .. " 件，得金币 " .. earned)
    end
    return true
end

---批量使用：逐瓶结算带中断
function Bulk.useDrugs(actor, count)
    local player = class(actor)
    if not player then return 0 end
    local used = 0
    for i = 1, math.min(count, 50) do
        -- 血满即停：多余的药不浪费
        if actor:GetHp() >= actor:GetMaxHp() then
            sendmsg(actor, 1, "生命已满，剩余 " ..
                (count - used) .. " 瓶未使用")
            break
        end
        if not checkitemw(actor, "金创药", 1) then
            sendmsg(actor, 1, "金创药已用完")
            break
        end
        takeitem(actor, "金创药", 1, 0, "批量使用")
        humanhp(actor, "+", 200)
        used = used + 1
    end
    return used
end