Pengaruh Edukasi Skala Nyeri Numeric Rating Scale terhadap Pengetahuan NRS pada Pasien Anestesi Spinal di RSUD Brebes: The Effect of Numeric Rating Scale Pain Scale Education on Knowledge of NRS Among Patients Undergoing Spinal Anesthesia at RSUD Brebes (Universitas Muhammadiyah Palu, 2026)