By Christopher Bucktin From the outside looking in, Crystal Hefner had it all. A Beverly Hills chateau, a multi-millionaire husband, expensive cars, designer clothes and a lifestyle that many Hollywood wives envied. But as the wife of Hugh Hefner, behind the doors of the Playboy Mansion, she was in a five-year loveless marriage in which she felt imprisoned. Now, six years after the world’s most famous Lothario’s death from sepsis at 91, the model has lifted the lid on life with Hef in her new book, revealing a story steeped in coercion, control and the pursuit of her freedom. In Only Say Go…