San Francisco is cracking down on hot dog vendors and urging people living on the street to seek shelter as it races to prepare for a major international summit and reverse its image as a city in decline. Officials are looking at cosmetic cleanups such as scrubbing sidewalks and repainting fire hydrants ahead of the Asia-Pacific Economic Cooperation summit November 15-18, according to emails obtained by Bloomberg News through an open-records request. But they also are planning measures such as opening additional shelter beds for the city’s unhoused...