feat: initial zeropost-engine structure

- AI service with Anthropic claude-sonnet-4-6
- Bull queue for async generation jobs
- Routes: /api/generate, /api/channels, /api/posts
- PostgreSQL schema: users, channels, posts, generation_jobs
- Supports: post, article, topics generation types

src/routes/channels.js

@@ -0,0 +1,50 @@
+const express = require('express');
+const router = express.Router();
+const { query } = require('../config/db');
+
+// GET /api/channels - list channels for user
+router.get('/', async (req, res) => {
+  const userId = req.headers['x-user-id'];
+  if (!userId) return res.status(401).json({ error: 'Unauthorized' });
+  const { rows } = await query(`SELECT * FROM channels WHERE user_id=$1 ORDER BY created_at DESC`, [userId]);
+  res.json(rows);
+});
+
+// POST /api/channels - create channel
+router.post('/', async (req, res) => {
+  const userId = req.headers['x-user-id'];
+  if (!userId) return res.status(401).json({ error: 'Unauthorized' });
+  const { name, tgChannelId, botToken, topic, tone, language } = req.body;
+  if (!name) return res.status(400).json({ error: 'name is required' });
+  const { rows } = await query(
+    `INSERT INTO channels (user_id, name, tg_channel_id, bot_token, topic, tone, language) VALUES ($1,$2,$3,$4,$5,$6,$7) RETURNING *`,
+    [userId, name, tgChannelId || null, botToken || null, topic || '', tone || 'neutral', language || 'ru']
+  );
+  res.json(rows[0]);
+});
+
+// PATCH /api/channels/:id - update channel
+router.patch('/:id', async (req, res) => {
+  const userId = req.headers['x-user-id'];
+  const { name, topic, tone, language, botToken, tgChannelId, isActive, postSchedule } = req.body;
+  const { rows } = await query(
+    `UPDATE channels SET 
+      name=COALESCE($1,name), topic=COALESCE($2,topic), tone=COALESCE($3,tone),
+      language=COALESCE($4,language), bot_token=COALESCE($5,bot_token),
+      tg_channel_id=COALESCE($6,tg_channel_id), is_active=COALESCE($7,is_active),
+      post_schedule=COALESCE($8,post_schedule)
+    WHERE id=$9 AND user_id=$10 RETURNING *`,
+    [name, topic, tone, language, botToken, tgChannelId, isActive, postSchedule ? JSON.stringify(postSchedule) : null, req.params.id, userId]
+  );
+  if (!rows.length) return res.status(404).json({ error: 'Channel not found' });
+  res.json(rows[0]);
+});
+
+// DELETE /api/channels/:id
+router.delete('/:id', async (req, res) => {
+  const userId = req.headers['x-user-id'];
+  await query(`DELETE FROM channels WHERE id=$1 AND user_id=$2`, [req.params.id, userId]);
+  res.json({ ok: true });
+});
+
+module.exports = router;