By Brad Brooks and Jonathan Drake FORT MYERS, Fla./CHARLESTON, S.C. (Reuters) -Florida and the Carolinas, staggered by one of the fiercest storms in U.S. history, faced a massive recovery on Saturday as remnants of Hurricane Ian threatened further flooding along the Eastern Seaboard while leaving tens of billions of dollars in damage in its wake. The number of confirmed fatalities from Ian rose to at least 50, most in Lee County, Florida, which bore the brunt of the storm when it slammed ashore the state’s Gulf Coast on Wednesday as a Category 4 hurricane packing maximum sustained winds of 150…