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  Boston’s Jaylen Brown, center, dribbles against Golden State’s Klay Thompson during the fourth quarter in Game 1 of the N.B.A. finals. Brown finished with 24 points. Credit... Ezra Shaw/Getty Images SAN FRANCISCO — After a long and eventful road to the N.B.A. finals,  Golden State  was grateful for a full week to rest and recover before facing the  Boston Celtics  in Game 1 on Thursday night. Golden State’s modest break came to an abrupt end. Boston made sure of it, stunning Golden State, 120-108, to take the opening game of the best-of-seven series at Chase Center. The Celtics leaned on their depth to erase a 15-point deficit in the second half. Al Horford scored a team-high 26 points, while Jaylen Brown added 24 and Derrick White scored 21 off the bench. Jayson Tatum scored just 12 points in the win while shooting 3 of 17 from the field, but he had a game-high 13 assists. The Celtics also managed to overcome a turbocharged effort form Golden State’s Step...