Whether she’s comfortable with it or not, the Barefoot Contessa star has one of the most devoted fandoms among cookbook giants. An unprecedented look inside her picture-perfect empire. — I have been inside the barn, the barn, and I can tell you this: Inside, it was beautiful. I didn’t grow up with religious institutions, really, but there was something about the space that was, assuredly, holy. When I first entered it, I leaned back, mouth agape, and took in…