The owners of a Seadrift home who broke rules designed to protect delicate waterfront ecosystems have received a permit to legalize landscaping and construction work. Last Friday, the California Coastal Commission granted William and Stephanie Mellin a coastal development permit with conditions, including a requirement that they donate $25,000 to an as-yet-unnamed nonprofit that supports coastal education and stewardship. The Mellins’ 2,200-square-foot home sits on a half-acre lot on Dipsea Road, partially perched on stilts…