PARIS — As he headed into the office on a stormy Wednesday morning last week, French customs official Yann Favennec was expecting the day to be good — but stressful. Favennec, the 47-year-old chef de projet of Lille’s bid to host a new EU customs authority, gathered his four-person team at 8:30 a.m. in their office on the outskirts of Paris. With coffee and croissants on their desks and vote simulators on a big screen, they hunkered down to follow the nine-way contest . Top-level lobbying,