【引擎触发】七日目标：新手七日任务链与目标系统引擎实现

---playlevelup: 升级触发，推进等级类目标
function playlevelup(actor, level)
    local day = Goal.dayOf(actor)
    if not day then return end
    if level >= 15 and day == 1 then
        setplayvar(actor, "HUMAN", "Goal_1_1", 1, 1)
        sendmsg(actor, 1, "七日目标完成：等级达到 15 级")
    end
end

---killmon: 击杀触发，推进杀怪类目标
function killmon(actor, monName)
    local day = Goal.dayOf(actor)
    if day ~= 2 then return end
    local n = tonumber(getplayvar(actor, 2, "Goal_2_2")) or 0
    if n >= 100 then return end
    setplayvar(actor, 2, "Goal_2_2", n + 1, 0)
end

---领取：完成校验加幂等标记
function Goal.claim(actor, day, idx)
    local done = getplayvar(actor, 2, "Goal_" .. day .. "_" .. idx)
    if done == nil or done == "" then
        sendmsg(actor, 1, "目标未完成")
        return false
    end
    local key = "Claimed_" .. day .. "_" .. idx
    if (getplayvar(actor, 2, key) or "") ~= "" then
        sendmsg(actor, 1, "已领取")
        return false
    end
    setplayvar(actor, "HUMAN", key, os.time(), 1)
    giveitem(actor, "七日礼盒", 1)
    sendmsg(actor, 1, "七日目标奖励已领取")
    return true
end