【引擎触发】师徒历练：师徒共同任务的进度与奖励引擎实现

---共同任务完成：四重校验后双向累加
function Mentor.taskDone(actor, masterName)
    local myMaster = getplayvar(actor, 2, "MasterName")
    if myMaster ~= masterName then return false end
    local members = getgroupmember(actor) or {}
    local together = false
    for _, mate in ipairs(members) do
        if mate:GetName() == masterName then together = true end
    end
    if not together then return false end
    -- 每日历练上限 5 次
    local dayKey = "MentorDaily_" .. os.date("%Y%m%d")
    local today = tonumber(getplayvar(actor, 2, dayKey)) or 0
    if today >= 5 then return false end
    setplayvar(actor, 2, dayKey, today + 1, 0)
    Mentor.bumpExp(actor, masterName)
    return true
end

---历练值 10/30/60 三档勋章
local TIERS = { [10] = "历练铜章", [30] = "历练银章", [60] = "历练金章" }

function Mentor.bumpExp(actor, masterName)
    local exp = tonumber(getplayvar(actor, 2, "MentorExp")) or 0
    exp = exp + 1
    setplayvar(actor, "HUMAN", "MentorExp", exp, 1)
    for tier, medal in pairs(TIERS) do
        if exp == tier then
            giveitem(actor, medal, 1)
            sendmsg(actor, 1, "获得师徒勋章：" .. medal)
        end
    end
    if exp == 60 then
        QF_Broadcast(actor:GetName() .. " 与师父 " .. masterName .. " 的历练达满档金章！")
    end
end