Robin Kaye, an award-winning music supervisor on "American Idol," was found dead inside her Los Angeles home ... and TMZ has learned she and her husband, Thomas Deluca, were the victims of a gruesome double murder. Our law enforcement sources tell us the bodies of the couple were discovered Monday inside their house in Encino after LAPD officers showed up for a welfare check. We're told cops saw blood at the front entrance and then smashed a window to gain entry to the home, where they found Robin and Thomas suffering from possible gunshot wounds. They were both declared dead...