【引擎触发】行会篝火：行会日常活动与篝火经验圈的引擎实现

function QF.LightCampfire(plr)
    local guild = GuildMgr.get(plr.guildId)
    if not guild or guild.leader ~= plr.id then
        return false, "仅帮主可点燃篝火"
    end
    local key = "campfire_" .. guild.id .. "_" .. os.date("%Y%m%d")
    if QF_HasFlag(key) then return false, "今日篝火已点燃" end
    QF_SetFlag(key)
    local fire = QF_AddGroundZone({
        kind = "campfire", map = "guild_map",
        x = plr.x, y = plr.y, radius = 4,
        owner = guild.id, expireAt = os.time() + 1800,
        expBonus = 1.5,
    })
    QF_BroadcastGuild(guild.id, "篝火已点燃，围坐获得 1.5 倍经验！")
    return fire
end

function Campfire.tick(fire)
    for _, plr in ipairs(QF_PlayersInArea(fire.map, fire.x, fire.y, fire.radius)) do
        if plr.guildId == fire.owner then
            plr:AddState("campfire_buff", 5000, { expMul = fire.expBonus })
        end
    end
end