A 68-year-old man with diabetes and hypertension presents with severe RUQ pain, fever (39.2°C), and hypotension (BP 90/55). Ultrasound shows a dilated gallbladder (8 cm), thickened wall (6 mm), pericholecystic fluid, and a stone impacted in the cystic duct. WBC 18,500/μL, bilirubin 2.8 mg/dL, lactate 3.2 mmol/L. He has severe COPD and ejection fraction of 35%. What is the most appropriate immediate next step in management?