49ers sign fullback Trey Millard

The 49ers continue to plug away at signing their 12-player draft class. Oklahoma fullback Trey Millard is the latest draft pick to sign. The 49ers announced Tuesday they had struck a four-year deal with Millard, one of their two seventh-round selections. The 6-foot-2, 247-pound Millard rushed for 538 yards and six TDs on 98 carries…