The force doesn't directly affect extra galactic life look at the Yuzan Vong neither Jedi nor Sith can directly hurt or use the force against them even force meditation to predict future battles and enemy numbers doesn't work. As for the star forge there's only one while the forerunners alone have hundreds of ship building yards and they can be produced in an extremely short amount of time. Fleets of single attack fighters and war sphinxes each with enough fire power to vaporise cites and up turn continents all created in minutes.