【引擎触发】setday：每日重置与签到刷新

---setday: 每天登录触发 actor:玩家名(字符串)
function setday(actor)
    local player = getplayerbyname(actor)   -- 字符串转玩家对象
    if not player then return end
    local today = os.date("%Y%m%d")
    -- 签到的日键按天换新，昨日标记自然失效
    setplayvar(player, "HUMAN", "SignDay", today, 1)
    sendmsg(player, 1, "新的一天开始了，记得签到与日常！")
    -- 每日副本次数清零
    setplayvar(player, "HUMAN", "DungeonCount", 0, 1)
end

---resetday: 跨天在线的玩家也会触发
function resetday(actor)
    local player = getplayerbyname(actor)
    if not player then return end
    sendmsg(player, 1, "已为您刷新每日任务与副本次数")
    setplayvar(player, "HUMAN", "DungeonCount", 0, 1)
end

---签到：日键幂等，连签奖励
function Sign.daily(actor)
    local player = getplayerbyname(actor)
    if not player then return false end
    local today = os.date("%Y%m%d")
    if (getplayvar(player, 2, "SignDay") or "") == today then
        sendmsg(player, 1, "今日已签到")
        return false
    end
    setplayvar(player, "HUMAN", "SignDay", today, 1)
    local streak = tonumber(getplayvar(player, 2, "SignStreak")) or 0
    setplayvar(player, "HUMAN", "SignStreak", streak + 1, 1)
    -- 连签 7 天给大奖
    if (streak + 1) % 7 == 0 then
        giveitem(player, "连签宝箱", 1)
        sendmsg(player, 1, "连签 7 天，连签宝箱已发放！")
    else
        giveitem(player, "签到礼包", 1)
    end
    return true
end