【性能调优】技能特效分级：特效密度的动态调整

-- 特效分级：密度监测
local panel = GUI:GetParent("MainTop")
local fxCount = 0
local curGrade = 1
local lastSwitch = 0
local function updateFxGrade(now)
    if now - lastSwitch < 5 then return end
    local newGrade = fxCount < 20 and 1 or (fxCount < 40 and 2 or 3)
    if newGrade ~= curGrade then
        curGrade = newGrade
        lastSwitch = now
        SL:SendNetMsg(9993, "fxgrade|" .. newGrade)
    end
end

-- 档位执行：削减规则
local player = class(actor)
local function renderSkillFx(skillId, grade)
    local cfg = {particles = true, trail = true, ground = true}
    if grade >= 2 then cfg.trail = false end
    if grade >= 3 then
        cfg.particles = false
        cfg.trail = false
    end
    SL:SendNetMsg(9994, skillId .. "|" ..
        (cfg.particles and 1 or 0) .. "|" ..
        (cfg.ground and 1 or 0))
    return cfg
end