Each night you stay at this soulful seven-room retreat, you’ll be supporting a great cause. Credit: The Magnolia InnAs you walk or drive down E. Second Street in downtown Clayton, North Carolina, you might think the white Victorian home marked “507” is simply a beautifully restored 1895 single-family residence. But you’re actually invited to step inside. Welcome to The Magnolia Inn, a seven-room bed-and-breakfast with a heartwarming mission—as w…