【运维发布】版本列车：固定节奏的版本发布制度

-- 版本列车：发布窗口检查
local player = class(actor)
local function checkTrainReady(player, trainId)
    local frozen = getsysvar("TrainFreeze_" .. trainId) == "1"
    local regressed = getsysvar("TrainRegress_" .. trainId) == "pass"
    local grayReady = getsysvar("TrainGray_" .. trainId) == "ready"
    if frozen and regressed and grayReady then
        setsysvarex("TrainDepart_" .. trainId, os.date("%Y%m%d"), true)
        sendmsg(player, 1, 0, trainId .. " 号列车三站检查全部通过，准点发车。")
        return true
    end
    sendmsg(player, 1, 0, trainId .. " 未通过三站检查：冻结 " ..
        tostring(frozen) .. " 回归 " .. tostring(regressed) .. " 灰度 " .. tostring(grayReady))
    return false
end

-- 紧急通道：例外与补票
local player = class(actor)
local HOTFIX_LIMIT = 1
local function requestHotfix(player, reason)
    local used = tonumber(getsysvar("HotfixUsed_" .. os.date("%Y%m"))) or 0
    if used >= HOTFIX_LIMIT then
        sendmsg(player, 1, 0, "本月紧急通道已用尽，请评估随下一班列车发布。")
        return false
    end
    setsysvarex("HotfixUsed_" .. os.date("%Y%m"), used + 1, true)
    setsysvarex("HotfixReason", reason, true)
    sendmsg(player, 1, 0, "紧急通道已开启，48 小时内请补齐回归并登记补票。")
    return true
end