【后端接口】行会擂台：守擂判定的接口实现

-- NPC 挑战入口：资格校验通过后传送进场
local player = class(actor)
local myGuild = getmyguild(player)
if myGuild == nil or myGuild == "" then
    sendmsg(player, 1, 0, "尚未加入行会，无法挑战擂台。")
    return
end
local owner = getplayvar(player, "GUILD", "ArenaOwner")
if owner == myGuild then
    sendmsg(player, 1, 0, "本行会已是擂主，无需挑战。")
    return
end
if not checkitemw(player, "挑战书", 1) then
    sendmsg(player, 1, 0, "背包里缺少挑战书。")
    return
end
takeitem(player, "挑战书", 1)
beginteleport(player, 33, 45)

-- 归属切换：新擂主行会写入并计连胜
local player = class(actor)
local myGuild = getmyguild(player)
setplayvar(player, "GUILD", "ArenaOwner", myGuild, true)
local wins = tonumber(getplayvar(player, "GUILD", "ArenaWins") or 0) + 1
setplayvar(player, "GUILD", "ArenaWins", wins, true)
sendmsg(player, 1, 0, myGuild .. " 接管擂台，当前连胜 " .. wins .. " 场。")
local box = wins >= 5 and "擂台宝箱金" or "擂台宝箱银"
giveitem(player, box, 1)