A 21-year-old male presents with low-grade fever, night sweats, dry cough, and fatigue. Two months ago, he developed right-sided chest pain. Physical exam shows tracheal deviation to the left, dullness to percussion in the right lower chest, and absent breath sounds. Chest X-ray reveals a large right-sided pleural effusion. Diagnostic thoracentesis yields pale yellow fluid with: specific gravity 1.020, Rivalta test (+), protein 47g/L, WBC count 685x10^6/L (70% lymphocytes), and ADA >45U/L. What is the most likely diagnosis?