Chicago aldermen on Monday pummeled the city’s top attorney with questions for more than an hour over the city’s red-light and speed-camera systems before giving the first nod to a $38.75 million deal to settle a pair of lawsuits over those systems.Corporation Counsel Edward N. Siskel was in the hot seat as city lawmakers pressed him on what they saw were the shortcomings of the camera systems, which have been at the center of both a political and legal controversy.“We have to pay out $39 million for a …