下线保存：退出时进度写入存档

-- 错误：只押注下线回调，闪断就丢档
function onLogout(p)
    saveAll(p)
end

local function saveNow(p)
    setplayvar(p, "sv_exp", getplayvar(p, "EXP") or 0)
    setplayvar(p, "sv_gold", getplayvar(p, "GOLD") or 0)
    setplayvar(p, "sv_time", os.time())
end
local function onHeartbeat(p)
    local last = getplayvar(p, "sv_time") or 0
    if os.time() - last > 60 then
        saveNow(p)
    end
end
local function onLogout(p)
    saveNow(p)
end