In some ways, “Melania,” the new documentary about Melania Trump, feels almost avant-garde. It rejects everything we normally associate with the commercial success of a bio-pic: narrative, suspense, authenticity, even one unguarded moment. But in another way it’s bracingly honest. President Donald Trump and his wife have made no effort to hide that, over a dinner at Mar-a-Lago shortly after the 2024 election, she personally pitched the project to Jeff Bezos, the founder of Amazon, who has vast financial interests in government contracts and antitrust policy. Nor have the Trumps dissembled about Amazon’s payment of forty million dollars for the…