She struck gold — while flat on her back.  US Navy veteran-turned-OnlyFans star Addyson James was all but homeless and living and working at a brothel when she met a rich, elderly widower — and now, they’re happily hitched.  The real-life “Pretty Woman”-style plot twist came after a herniated disc surgery forced James, 46, to take a months-long break from her adult film career, she told The Post. “I wasn’t working and I just had a minimal amount of money coming in from OnlyFans, so I had to