feat: post drafts system — batch generation + daily auto-drafts

DB: post_drafts(channel_id, topic, text, image_url, status), channels.auto_draft_*
Engine:
  services/draftService.js: generateOneDraft, generateBatch, generateDailyDrafts,
    approveDraft(→scheduled_post), rejectDraft, updateDraft, listDrafts
  routes/drafts.js: GET/PATCH/DELETE /api/drafts/:id, /approve, /reject
    POST /api/channels/:channelId/drafts/generate?count=N (async, returns immediately)
  index.js: cron каждые 30 мин → generateDailyDrafts() для каналов с auto_draft_enabled
  channels.js: updateChannel сохраняет auto_draft_enabled/count/time

index.js

@@ -106,7 +106,8 @@ app.use('/api/metrics',  metricsRoutes);
 app.use('/api/usage',    usageRoutes);
 app.use('/api/billing', require('./src/routes/billing'));
 app.use('/api/channels', require('./src/routes/polls'));
-app.use('/api', inboxRoutes); // /inbox/:id, /inbox/:id/reply, /tg-webhook/:channelId
+app.use('/api', inboxRoutes);
+app.use('/api', require('./src/routes/drafts'));
 
 app.get('/health', (req, res) => {
   res.json({ ok: true, service: 'zeropost-engine', time: new Date() });
@@ -120,6 +121,17 @@ const start = async () => {
   // Автоматический ретрай SVG-заглушек
   require('./src/services/coverRetry').start();
 
+  // Ежедневные авто-черновики (каждые 30 мин проверяем каналы с auto_draft_enabled)
+  const draftSvc = require('./src/services/draftService');
+  setInterval(async () => {
+    try {
+      const n = await draftSvc.generateDailyDrafts();
+      if (n > 0) console.log(`[Drafts] Daily auto-drafts: generated for ${n} channels`);
+    } catch (err) { console.error('[Drafts] daily error:', err.message); }
+  }, 30 * 60 * 1000);
+  // Первый запуск через 5 мин после старта
+  setTimeout(() => draftSvc.generateDailyDrafts().catch(() => {}), 5 * 60 * 1000);
+
   app.listen(config.port, () => {
     console.log(`[Engine] Running on port ${config.port}`);
   });