In a calculated move amidst escalating legal troubles, Sean “Diddy” Combs recently paid off the $18.8 million mortgage on his opulent Star Island mansion, a decision made just before the unveiling of serious federal sex-trafficking charges against him. The hip-hop mogul’s $48.5 million estate, a centerpiece of his lavish lifestyle, became a focal point during a dramatic bond hearing where prosecutors laid bare allegations of wild parties involving female victims and male sex workers.…