A 75-year-year-old man presents with a 3-day history of productive cough (green sputum), fever (38.5°C), and shortness of breath. On examination, his respiratory rate is 24/min, heart rate 110/min, BP 130/80 mmHg, and oxygen saturation 93% on air. Crackles are heard in the right lower lung zone. His CURB-65 score is calculated as 1 (Age >= 65). What is the most appropriate management setting according to NICE NG138?