It's possible that Los Angeles is a figment of its own imagination. No other city studies itself so intently - on film, television and in glossy magazines. LA is where the American Dream is manufactured, and if you're not prepared to embrace the dream, you'll doubtless find it filthy, irritating, frightening or just plain dumb. But if you long to stand in the footsteps of stars and breathe their hallowed air, you've come to the right place. In this town, game show hosts are household names and nobodies erect billboard shrines to themselves