DETROIT — Matthew Stafford dropped back and perfectly lofted the ball where only Calvin Johnson could catch it. Johnson leaped to come down with the 25-yard pass in the end zone for the first of a career-high-matching three touchdown receptions. Stafford also tied a personal best with five scoring passes, and the surging Detroit Lions kept the Philadelphia Eagles reeling with a 45-14 rout Thursday. “When we’re on point like that, it’s hard to stop,” Johnson said. The Lions (4-7) have won three straight since firing their team president and general manager, and three in a row in their annual Thanksgiving Day game. Detroit ran for 108 yards, tied a season high with six sacks and Matt Prater made a 48-yard field goal. “That’s as complete a victory as we’ve had since we’ve been here,” said Jim Caldwell, who won 11 games last season in his first year as Detroit’s coach. The Eagles (4-7) have lost three straight.