SEATTLE — John Clayton, who carved out a legendary name in Seattle sports media during a career that spanned 36 years in the area, died Friday. Clayton was 67. In a statement Friday night, the Seahawks said Clayton had died after a brief illness. Clayton’s last story on MyNorthwest.com appeared just a little over a week ago, March 10. He had recently been hospitalized. The Seahawks’ statement said they were “heartbroken” to learn of his death. In a story posted Friday night on MyNorthwest.com, Bonneville Seattle Senior Vice President and Market Manager Cathy Cangiano said: “John was a treasure…