The recent layoffs at Tokyopop, the U.S. manga publisher founded by Stu Levy in Japan and L.A. in 1996 and 1997, have turned a spotlight on the house’s decline over the last few years. Battered by the economy, a global decline in manga sales and now the Borders bankruptcy, Tokyopop is a smaller company, much reduced from the days when it published as many as 500 books a year and virtually defined