feat: editor_notes + /api/stats/live + tokens в getArticleBySlug

- БД: таблица editor_notes (title/content/author/tags/is_pinned/is_published)
- routes/notes.js: CRUD заметок редактора
- /api/stats/live: latest article, processing job, активность за 7 дней
- getArticleBySlug: JOIN с generation_jobs для tokens_in/out

src/services/articles.js

@@ -47,7 +47,10 @@ async function listArticles({ limit = 20, offset = 0, tag = null } = {}) {
 
 async function getArticleBySlug(slug) {
   const { rows } = await query(
-    `SELECT * FROM articles WHERE slug=$1 AND status='published'`,
+    `SELECT a.*, j.tokens_in, j.tokens_out
+     FROM articles a
+     LEFT JOIN generation_jobs j ON j.id = a.job_id
+     WHERE a.slug=$1 AND a.status='published'`,
     [slug]
   );
   if (!rows.length) return null;