{"message":"Casti Publishing API Server","version":"1.0.0","documentation":"/api/v1/docs","health":"/healthz","endpoints":{"api":"/api/v1 (Internal API Key 인증)","oauth":"/api/v1/oauth (소셜 플랫폼 콜백 - 인증 불필요)","webhooks":"/api/v1/webhooks (AWS SNS 콜백 - 인증 불필요)","public":"/public (구독자용 - 인증 불필요)"}}