Add user authentication and role management

.dev.vars.example

@@ -1,5 +1,6 @@
 KOC_PORTAL_URL=http://localhost:3000
-ADMIN_ALLOWED_EMAIL=operator@example.com
+SUPER_ADMIN_USERNAME=admin
+SUPER_ADMIN_PASSWORD=qazxsw123admin
 ADMIN_INTERNAL_TOKEN=replace-with-a-random-secret
 
 # Optional override. The production key must be stored as a runtime secret.