feat: implement course certificate generation system with organization-level toggles

services/cms-service/migrations/20260414000001_add_certificate_toggle.sql

@@ -0,0 +1,8 @@
+-- Add certificate generation toggle to organization exercise settings
+-- Allows organizations to disable built-in certificate generation if using external systems
+
+ALTER TABLE organization_exercise_settings
+    ADD COLUMN IF NOT EXISTS certificates_enabled BOOLEAN NOT NULL DEFAULT TRUE;
+
+COMMENT ON COLUMN organization_exercise_settings.certificates_enabled 
+    IS 'Enable/disable built-in certificate generation. When false, students cannot generate/download certificates from the platform.';