{"service":"UPG DTE API","version":"1.0.0","description":"API REST para Facturación Electrónica Chile (DTE)","docs":{"health":"GET /health","tenants":"GET|POST /api/tenants","dte":"POST /api/dte/generate","caf":"GET /api/caf/available","sii":"POST /api/sii/authenticate","pdf":"GET /api/pdf/:dteId | POST /api/pdf/preview"}}