Is it permissible for a married woman to undergo breast augmentation and lift surgery (silicone) with the intention of pleasing her husband, and does it become permissible with this intention? And what is the ruling on one who performs such an act if he knows it is forbidden?

If breast augmentation and lift surgery is Haram, then it is not permissible, even for the sake of the husband. This is because a good intention does not make a bad act good, and sins do not transform into acts of obedience through intention. Whoever commits a forbidden act, knowing it to be forbidden, incurs sin, and should be advised gently and kindly.