快捷键定制：按键映射与冲突检测

-- 错误：绑定不查重，一键双触发
function bindKey(key, action)
    binds[key] = action
end

local binds = {["1"] = "skillA", ["2"] = "skillB"}
local function bindKey(key, action)
    if binds[key] ~= nil then
        showTip("该键已绑定 " .. binds[key])
        return false
    end
    binds[key] = action
    saveBinds(binds)
    showTip("绑定成功")
    return true
end