Paris AP  —  The Louvre, the world’s most-visited museum and a global symbol of art, beauty and endurance, remained shuttered Monday — not by war, not by terror, but by its own exhausted staff, who say the institution is crumbling from within. 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. And yet, the moment felt bigger than a labor