【引擎触发】押镖系统：镖车护送与劫镖判定的引擎实现

local ESCORT_REWARD = { base = 50000, perKm = 5000 }
function QF.AcceptEscort(plr, routeId)
    if plr:HasEscort() then return false, "已在押镖中" end
    local deposit = 20000
    if not plr:TakeGold(deposit) then return false, "押金不足" end
    local cart = QF_SpawnCart(plr, routeId)
    cart.hp = cart.maxHp
    cart:SetFollow(plr, 2)
    plr.escort = { route = routeId, cart = cart, deposit = deposit }
    return true
end

function QF.CartDestroyed(cart, killer)
    local owner = cart:GetOwner()
    owner.escort = nil
    owner:SendMsg("镖车被劫！押金不予退还")
    QF_GiveGold(killer, cart.cargo)
    QF_SendMsg(killer, "劫镖成功，获得镖银 " .. cart.cargo)
    QF_AddPkValue(killer, 30)
end

function QF.EscortDone(plr)
    local e = plr.escort
    QF_GiveGold(plr, ESCORT_REWARD.base + e.route.distance * ESCORT_REWARD.perKm / 1000)
    plr:TakeGold(e.deposit) and QF_GiveGold(plr, e.deposit)
    plr.escort = nil
end