If you have a Visa Signature rewards card, Visa, the Golden Gate Restaurant Association, and almost 50 Bay Area restaurants have cooked up a little present for you: a nice little pamphlet of crab recipes, titled SF Chefs. Food. Wine.: Dungeness Crab. Inside you'll find recipes from A (Angel Hair Crab Lasagna, from Andrea Froncillo, executive chef/owner of Franciscan Crab Restaurant) to Z (well, W: Wok Roasted Ginger-Scallion Dungeness Crab, from George Chen, chef/owner of Shanghai 1930). The res