A 29-year-old woman presents with fever, pleuritic chest pain and productive cough with rusty sputum. She is otherwise healthy, respiratory rate 22/min, BP 120/70 mmHg, SpO₂ 95% on room air. Chest X-ray confirms a right lower lobe consolidation. She is suitable for outpatient treatment. According to current Australian antibiotic guidance, what is the most appropriate empirical oral therapy?