Rookie Brock Purdy threw for 332 yards and three touchdowns as he led the 49ers to a 41-23 win over the Seahawks on Saturday in the NFC Wild Card round in Santa Clara.  Purdy also ran for a score in his NFL playoff debut and became the first rookie QB with four total touchdowns in a playoff game.  Deebo Samuel caught six passes for 133 yards and a touchdown in the victory.  Seattle led 17-16 going into halftime, but wouldn't score again until under two minutes left in the fourth quarter.  The 49ers will face either the Cowboys or Buccaneers in the Divisional round on Sunday night.