feat: map Keycloak realm roles to Spring RBAC

backend/src/main/java/com/example/keycloakpattern/ApiController.java

@@ -27,4 +27,9 @@ public class ApiController {
         response.put("audience", jwt.getAudience());
         return response;
     }
+
+    @GetMapping("/admin")
+    public Map<String, String> adminEndpoint() {
+        return Map.of("status", "ok", "authorization", "admin-role");
+    }
 }