【后端接口】镖车护送：押镖的劫镖与到达奖励

---接镖：等级门槛与镖车生成
function Escort.accept(actor)
    local player = class(actor)
    if not player then return false end
    if actor:GetLevel() < 40 then
        sendmsg(actor, 1, "等级需达 40 级才能押镖")
        return false
    end
    local busy = getplayvar(actor, 2, "EscortActive")
    if busy and busy ~= "" then
        sendmsg(actor, 1, "已有镖车在护送中")
        return false
    end
    setplayvar(actor, "HUMAN", "EscortActive", os.time(), 1)
    setplayvar(actor, "HUMAN", "EscortStart", os.time(), 1)
    recallmob(actor, "镖车", 1)
    sendmsg(nil, 1, actor .. " 开始押镖，劫镖有风险！")
    return true
end

---劫镖：击毁镖车的结算
function Escort.rob(killer, actor)
    local player = class(killer)
    if not player then return end
    -- 掉落镖车携带的金币
    local gold = math.floor(Rent.escortGold(actor) * 0.5)
    giveitem(killer, "金币", gold)
    -- 劫镖者红名值增加
    local pk = tonumber(getplayvar(killer, 2, "PKValue")) or 0
    setplayvar(killer, "HUMAN", "PKValue", pk + 200, 1)
    sendmsg(nil, 1, killer:GetName() .. " 劫走了 " ..
        actor .. " 的镖车！")
    setplayvar(actor, "HUMAN", "EscortActive", "", 1)
end