RENTON, Wash. — Maybe it was as simple as this. “I didn’t want to move,’’ DK Metcalf said during a conference Friday to announce his three-year contract extension that keeps him with the Seahawks through 2025. “Moving is stressful for me.” OK, so the $72 million overall extension, and possible $76 million he can make through 2025, were surely a factor, as undoubtedly was the $30 million signing bonus, the highest for a receiver in NFL history. But 24-year-old Metcalf, who grew up in Oxford, Miss., and attended college at Ole Miss, said Seattle has become his second home since being drafted in …