SAN FRANCISCO — Six months ago, on Opening Day, the Giants were still riding high from their 107-win season. Brandon Belt was still “The Captain,” riding in on a boat along the warning track. Logan Webb looked the part of staff ace. Darin Ruf was on the move. In their home finale Sunday afternoon, it was Wilmer Flores on the move, hustling home from second base to score the winning run on a walk-off single from David Villar in the bottom of the 10th. The Giants beat the D-backs, 4-3, to win their final home series and finish the season 44-37 on the shores of McCovey Cove. The beginning and the…