Your chances of getting a dinner reservation at Republique at 7:30 this Saturday night are somewhere between slim and none, unless your name is George Clooney. Or, unless you’re willing to pay up. New smartphone apps will take your money in exchange for hard-to-get seats at some of L.A.’s top restaurants. And that’s not the only way technology is changing the restaurant business. We get up to speed on all the latest innovations.