PARIS The Louvre, the world’s most-visited museum and a global symbol of art, beauty and endurance, has withstood war, terror, and pandemic — but on June 15, it was brought to a halt by its own striking staff, who say the institution is crumbling under the weight of mass tourism . It was an almost unthinkable sight: the home to works by Leonardo da Vinci and millennia of civilization’s greatest treasures, paralyzed by the very people tasked with welcoming the world to its galleries. Thousands