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

index.js

@@ -8,6 +8,7 @@ const channelsRoutes = require('./src/routes/channels');
 const postsRoutes = require('./src/routes/posts');
 const articlesRoutes = require('./src/routes/articles');
 const statsRoutes = require('./src/routes/stats');
+const notesRoutes = require('./src/routes/notes');
 
 // Start queue worker
 require('./src/workers/generation');
@@ -38,6 +39,7 @@ app.use('/api/channels', channelsRoutes);
 app.use('/api/posts', postsRoutes);
 app.use('/api/articles', articlesRoutes);
 app.use('/api/stats', statsRoutes);
+app.use('/api/notes', notesRoutes);
 
 app.get('/health', (req, res) => {
   res.json({ ok: true, service: 'zeropost-engine', time: new Date() });