【框架设计】坐骑合成：坐骑碎片与品质保底的接口实现

-- NPC 合成入口：校验碎片并执行合成
local player = class(actor)
local frag = tonumber(getplayvar(player, "HUMAN", "MountFrag") or 0)
if frag < 50 then
    sendmsg(player, 1, 0, "坐骑碎片不足 50 个，暂时无法合成。")
    return
end
setplayvar(player, "HUMAN", "MountFrag", frag - 50, true)
local lucky = math.random(1, 100)
local quality = 1
if lucky <= 8 then
    quality = 3
elseif lucky <= 30 then
    quality = 2
end
local tryCnt = tonumber(getplayvar(player, "HUMAN", "MountTry") or 0) + 1
if tryCnt >= 20 then
    quality = 3
end
setplayvar(player, "HUMAN", "MountTry", tryCnt, true)

-- 按品质发放坐骑并清理计数
if quality == 3 then
    giveitem(player, "烈焰战马", 1)
    setplayvar(player, "HUMAN", "MountTry", 0, true)
    sendmsg(player, 1, 0, "合成出高品质坐骑：烈焰战马！")
else
    local name = quality == 2 and "铁甲战马" or "灰鬃马"
    giveitem(player, name, 1)
    sendmsg(player, 1, 0, "本次合成获得：" .. name .. "，累计合成 " .. tryCnt .. " 次。")
end