SANTA CLARA, Calif. (AP) – Colin Kaepernick ran the read option to near perfection on the big stage against Green Bay back in January.  He ran right past the Packers, and through them, too.  Kaepernick’s breakout game in a breakthrough season came in his first career playoff start only two months after winning San Francisco’s starting job, carrying the 49ers to a 45-31 divisional-round victory in which he ran for a pair of touchdowns and threw for two more.  He set a quarterback playoff record in the process with 181 yards rushing in the win that sent San Francisco to a second straight NFC title game.  Linebacker Clay Matthews insists the Packers will be better prepared come Sunday’s opener at Candlestick Park when they try again to slow down – and stop – Kaepernick.