PARIS — It’s Monday, February 26, the start of Paris Fashion Week, and the public relations kingpin Lucien Pagès begins his day with a walkthrough of the space for Saint Laurent’s show, happening the following evening. He returns to his office to finalise the seating plan for the shows of clients like Schiaparelli, Sacai, Courrèges, Carven and Rabanne before a planning lunch with the organisers of the next Vogue World event. Then he…