By Joel Jose and Akash Sriram (Reuters) - Oracle shares retreated on Thursday after a record AI-driven surge in the previous session that put the company closer to the trillion-dollar mark and co-founder Larry Ellison within striking distance of the world's richest person title. The enterprise software maker's remarkable rise, fueled by a wave of multi-billion-dollar cloud deals, puts the spotlight on the scramble for computing power from companies that are pouring billions to become leaders in the AI ra ...