Is it permissible for my wife to subscribe to the Bar Association to benefit from its advantages (medical treatment and pension) in exchange for annual fees, knowing that she does not work and that the laws in our country are man-made?

There is no objection to the wife joining the Bar Association and benefiting from its services (medical treatment and pension) if membership is available to graduates, whether they are employed or not. The fact that the laws are man-made does not affect this, as what is given to the associations falls under the scope of state welfare for individuals.