Chrisitan McCaffrey is inactive for the 49ers’ Monday Night Football matchup against the New York Jets, according to NFL insider Mike Garafolo. McCaffrey is dealing with a calf-achilles injury. He was previously listed as questionable on the team’s injury report but has been limited since suffering the injury last week in practice. CLICK HERE to go to PrizePicks and use code ON3 to receive a guaranteed $50 once you play $5 in lineups! San Francisco and New York kickoff at 8:15 p.m. ET live on ABC and ESPN. This story will be updated The post Christian McCaffrey calf-achilles injury update: San…