【运维发布】问卷系统：满意度调查的抽样与回收

---问卷的抽样邀请：按活跃度分层
function Survey.invite(actor, surveyId)
    local player = class(actor)
    if not player then return false end
    -- 抽样：10% 的在线玩家受邀
    if math.random(1, 100) > 10 then return false end
    -- 已答过的不重复邀请
    local key = "Survey_" .. surveyId
    if (getplayvar(actor, 2, key) or "") ~= "" then
        return false
    end
    setplayvar(actor, "HUMAN", key, "invited", 1)
    sendmsg(actor, 1, "邀请您参与版本满意度调查，奖励 2000 金币")
    Survey.sendPanel(actor, surveyId)
    return true
end

---问卷的回收与统计
function Survey.submit(actor, surveyId, answers)
    local player = class(actor)
    if not player then return false end
    local key = "Survey_" .. surveyId
    if (getplayvar(actor, 2, key) or "") == "done" then
        sendmsg(actor, 1, "您已提交过问卷")
        return false
    end
    setplayvar(actor, "HUMAN", key, "done", 1)
    Survey.store(surveyId, actor:GetUserId(), answers)
    giveitem(actor, "金币", 2000)
    sendmsg(actor, 1, "感谢反馈，奖励已发放")
    return true
end