A 49-year-old patient presents with fever and cough for nearly 2 weeks, scant occasionally yellowish sputum, and chest tightness. Over the past 2 days, hemoptysis occurred with approximately 50ml of fresh blood daily. Physical exam reveals dullness on percussion and decreased breath sounds in the right upper lung, with moist rales. Chest X-ray shows consolidation with cavity formation in the right upper lobe (cavity diameter ~2.5cm, smooth wall, no air-fluid level). The preliminary diagnosis is most likely: