{"status":"ok","server":"Smart Kos — Monitoring Listrik Refactored (New ERD Layout)","wsClients":0,"endpoints":{"WS   ws://host:3000":"★ WebSocket real-time push","POST /api/pzem":"ESP32 kirim data sensor → broadcast WS","GET  /api/pzem":"Ambil data sensor terbaru (REST)","GET  /api/pzem/test":"Simulasi data sensor (tanpa hardware)","GET  /api/relay":"ESP32 ambil status relay","POST /api/relay":"ESP32 update relay","GET  /api/rooms":"Ambil semua data kamar (REST fallback)","POST /api/rooms":"Tambah kamar baru","PUT  /api/rooms/:id":"Update data penyewa","DELETE /api/rooms/:id":"Hapus kamar","POST /api/rooms/:id/toggle":"Toggle relay → broadcast WS","GET  /api/settings":"Ambil tarif listrik","POST /api/settings":"Update tarif listrik","GET  /api/debug/last":"Debug: data terakhir dari ESP32"}}