One of the city’s best new works of public architecture sounds like a perk for the country club set. And it is. Partly. Tucked into Crotona Park in the Bronx, the Cary Leeds Center for Tennis & Learning is anchored by a modest two-story concrete-and-steel clubhouse, all sleek surfaces and sharp angles, overlooking a competition-worthy pair of exhibition courts.  Devised by Gluck+, the New York architecture firm, the clubhouse and courts are stylish in the way that somebody with disposable income would regard as money well spent.  That’s money well spent in another way, too: The center provides after-school tutoring to homeless and other underserved young New Yorkers. In large measure, Cary Leeds