A 58-year-old woman with COPD (FEV₁ 42% predicted) on ICS/LABA/LAMA therapy presents with acute onset dyspnea, productive cough with purulent sputum, and fever (38.5°C) for 2 days. Chest X-ray shows no consolidation. Blood cultures are pending. She denies chest pain or leg swelling. Vital signs: RR 24/min, HR 110/min, BP 128/82 mmHg, SpO₂ 88% on room air. What is the most appropriate immediate management?

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