【框架设计】宠物进化：进化材料链与形态切换

---宠物进化：材料链的校验与消耗
function PetEvolve.evolve(actor, petId)
    local player = class(actor)
    if not player then return false end
    local stage = Pet.stageOf(actor, petId)
    if stage >= 3 then
        sendmsg(actor, 1, "宠物已达最终形态")
        return false
    end
    local mats = PET_EVOLVE_MATS[stage]
    for _, m in ipairs(mats) do
        if not checkitemw(actor, m[1], m[2]) then
            sendmsg(actor, 1, "缺少 " .. m[1] .. " x" .. m[2])
            return false
        end
    end
    for _, m in ipairs(mats) do
        takeitem(actor, m[1], m[2], 0, "宠物进化")
    end
    setplayvar(actor, "HUMAN", "PetStage", stage + 1, 1)
    Pet.remodel(actor, stage + 1)
    QF_Broadcast(actor .. " 的宠物进化为" ..
        PET_STAGE_NAME[stage + 1] .. "！")
    return true
end

---进阶的属性继承与跃升
function Pet.recalcAfterEvolve(actor, petId, newStage)
    local baseAtk = Pet.baseAtk(actor, petId)
    local evolveAtk = Pet.evolveAtk(newStage)
    local final = baseAtk + evolveAtk
    Pet.setAtk(actor, petId, final)
    -- 亲密度与等级保留
    local intimacy = Pet.intimacyOf(actor, petId)
    Pet.setIntimacy(actor, petId, intimacy)
    sendmsg(actor, 1, "宠物攻击更新为 " .. final ..
        "（含进化加成 " .. evolveAtk .. "）")
end