The Indirect Approach to 2012; New York and San Francisco Make Olympic Pitches
New York City and San Francisco find creative ways to present themselves to US Olympic Committee as both seek to be United States' entrant in international competition for 2012 Summer Games; cities must conform to strict rules enacted as result of scandals associated with Salt Lake City's bid for 2002 Winter Games when cash and gifts were given to members of International Olympic Committee; photos (M)