Mayor Rahm Emanuel’s administration is scrambling to contain a furor over the city’s red-light camera system, which may have ticketed thousands of motorists under questionable circumstances. Prompted by a Chicago Tribune investigation that revealed unexplained spikes in tickets issued, eight aldermen have asked the city’s top watchdog to launch a probe into the ticket surge, while private attorneys are gathering information for a possible class-action lawsuit. Emanuel has vowed to give motorists an …