【数据存储】排行榜奖励：上榜奖励的发放与补发

---排行榜奖励的发放
function BoardReward.distribute(boardName, rankList)
    local rewards = BOARD_REWARDS[boardName]
    for i, rec in ipairs(rankList) do
        if i <= rewards.maxRank then
            local tier = math.ceil(i / rewards.tierSize)
            local reward = rewards.tiers[tier]
            sendmail(rec.id, 9001, boardName .. " 第" .. i .. "名奖励", "", reward.items)
            rec.claimed = true
        end
    end
end

---补发：漏发的奖励自动补发
function BoardReward.checkMissed(boardName)
    local snapshot = QF_LoadJson("board_archive_" .. boardName)
    for _, rec in ipairs(snapshot.top50) do
        local claimed = rewardClaims[rec.id]
        if not claimed then
            local tier = math.ceil(rec.rank / rewards.tierSize)
            sendmail(rec.id, rewards.tiers[tier].items, "排行榜补发")
            rewardClaims[rec.id] = true
        end
    end
end