A 24-year-old sexually active woman presents to the emergency department with sharp right upper quadrant (RUQ) pain that began three days ago. She describes the pain as pleuritic, worsening with deep breaths and movement. She denies jaundice, nausea, or vomiting but reports fever, chills, lower abdominal discomfort, and a two-week history of abnormal vaginal discharge and dyspareunia (pain during intercourse). On examination: RUQ tenderness without rebound or guarding Mild lower abdominal tenderness Pelvic exam: Cervical motion tenderness (Chandelier sign) and purulent cervical discharge Laboratory findings: Elevated C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) Normal liver function tests Which of the following is the most likely diagnosis in this patient?