Does it have an armory or weapon racks, medical facilities, and facilities for troop-carrying? Otherwise, what is the point of a patrol ship being able to carry a rover?

In lore, the ship was not designed to carry a rover, it's more a happy accident that it can and is a good representation of the general cargo volume. It has no armory or troop-carrying abilities as that is not its role. Its typical role is fleet defense, so it would rely on other ships in the fleet for its medical needs.