add simple admin service

local-admin/src/entities/article/articleRepository.mjs

@@ -0,0 +1,20 @@
+import { readFile, rename, writeFile } from 'node:fs/promises';
+import { paths } from '../../config/paths.mjs';
+import { httpError } from '../../shared/http/httpError.mjs';
+
+export async function readArticles() {
+  const raw = await readFile(paths.articlesFile, 'utf8');
+  const articles = JSON.parse(raw);
+
+  if (!Array.isArray(articles)) {
+    throw httpError(500, 'Article database must be a JSON array');
+  }
+
+  return articles;
+}
+
+export async function writeArticles(articles) {
+  const temporaryFile = `${paths.articlesFile}.${process.pid}.tmp`;
+  await writeFile(temporaryFile, `${JSON.stringify(articles, null, 2)}\n`, 'utf8');
+  await rename(temporaryFile, paths.articlesFile);
+}