A 28-year-old man presents to the ENT clinic with a 5-day history of severe sore throat, dysphagia, and fever (39.2°C). On examination, the right tonsil is enlarged, erythematous, and covered with yellowish exudate. The uvula is deviated to the left. Intraoral palpation reveals a bulge in the soft palate above the tonsil. The patient has trismus (mouth opening ~2 cm). What is the most likely diagnosis?