【引擎触发】冰咆哮：范围减速与 AOE 结算的引擎实现

-- 技能释放触发：冰咆哮
function QF.IceStorm(plr, tx, ty)
    if not plr:CooldownReady("ice_storm") then return false end
    if plr:DistToXY(tx, ty) > 8 then
        return false, "超出施法距离"
    end
    plr:SetCooldown("ice_storm", 8)
    plr:CostMP(45)
    local targets = QF_GetUnitsInCircle(tx, ty, 3)
    for _, t in ipairs(targets) do
        if t.camp ~= plr.camp then
            local dmg = plr:GetMagic() * 1.5
            QF_ApplyDamage(plr, t, dmg, "ice")
            if not t:IsBoss() then
                t:AddState("slow", { expireAt = os.time() + 5, rate = 0.5 })
            end
        end
    end
    return true
end

function Slow.applyMoveSpeed(t, rate)
    local base = t:GetMoveSpeed()
    t:SetMoveSpeed(math.floor(base * rate))
    SL_UI:showSlowMark(t)
end