A 45-year-old man with a 15-year history of intravenous drug use presents with fatigue, jaundice, and abdominal pain. He reports multiple episodes of acute hepatitis in the past. On examination: hepatomegaly, ascites, and spider angiomas. Laboratory findings: ALT 180 IU/L, AST 320 IU/L (AST > ALT), bilirubin 6.5 mg/dL, albumin 2.8 g/dL, PT prolonged (INR 2.1). Serology: HBsAg positive, anti-HBc IgG positive, anti-HBe positive, HBeAg negative, anti-HDV positive, anti-HCV positive. What is the most likely diagnosis?