add simple admin service

local-admin/src/shared/http/sendError.mjs

@@ -0,0 +1,12 @@
+import { sendJson } from './sendJson.mjs';
+
+export function sendError(response, error) {
+  const status = error.status || 500;
+  const message = status >= 500 ? 'Internal server error' : error.message;
+
+  if (status >= 500) {
+    console.error(error);
+  }
+
+  return sendJson(response, { error: message }, status);
+}