【后端接口】自动拾取：拾取范围与过滤白名单

---自动拾取：掉落触发时的范围过滤
function addbag(actor, item)
    local player = class(actor)
    if not player then return end
    -- 自动拾取的开关与过滤规则
    if (getplayvar(actor, 2, "AutoPickOn") or "") == "" then
        return
    end
    local filter = getplayvar(actor, 2, "PickFilter") or ""
    local name = item:GetName()
    -- 白名单模式：只捡名单内的物品
    if filter ~= "" and ("|" .. filter .. "|"):find("|" ..
        name .. "|", 1, true) then
        return
    end
end

---拾取的节流：每秒最多 5 件
function Pickup.throttle(actor)
    local now = os.time()
    local secKey = "PickSec_" .. now
    local n = tonumber(getplayvar(actor, 2, secKey)) or 0
    if n >= 5 then
        return false
    end
    setplayvar(actor, 2, secKey, n + 1, 0)
    return true
end