SEATTLE — The Seahawks got their man, and Ryan Grubb gets the chance of a lifetime. An NFL source confirmed Friday night that the Seahawks have hired the former University of Washington assistant as their offensive coordinator, joining the staff of new coach Mike Macdonald. Grubb, Macdonald and Seahawks general manager John Schneider met Friday night to iron out the details. The announcement is expected within days, possibly Saturday. Macdonald and Schneider — who has final say on all personnel and coaching staffing now — set their sights on Grubb from almost the minute that Macdonald’s hiring…