DETROIT — There were no guarantees the Vancouver Canucks were going to make the playoffs when training camp began. There were more question marks than definitive answers when most people looked at the Vancouver lineup. Some players appeared to have hit a plateau. But look at the standings at the NHL All-Star break today, and there are the Canucks, tied with Boston atop the NHL with 71 points, and a league-best 33 victories. Even Patrik Allvin, the Canucks’ general manager, admitted this week, after signing a three-year contract extension, that he was bit surprised by Vancouver’s ascent. “Am I …