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

index.js

@@ -0,0 +1,43 @@
+const express = require('express');
+const config = require('./src/config');
+const { migrate } = require('./src/config/db');
+
+// Routes
+const generateRoutes = require('./src/routes/generate');
+const channelsRoutes = require('./src/routes/channels');
+const postsRoutes = require('./src/routes/posts');
+
+// Start queue worker
+require('./src/workers/generation');
+
+const app = express();
+app.use(express.json());
+
+// Simple internal auth middleware
+app.use((req, res, next) => {
+  const secret = req.headers['x-internal-secret'];
+  if (secret !== config.internalSecret) {
+    return res.status(401).json({ error: 'Unauthorized' });
+  }
+  next();
+});
+
+app.use('/api/generate', generateRoutes);
+app.use('/api/channels', channelsRoutes);
+app.use('/api/posts', postsRoutes);
+
+app.get('/health', (req, res) => {
+  res.json({ ok: true, service: 'zeropost-engine', time: new Date() });
+});
+
+const start = async () => {
+  await migrate();
+  app.listen(config.port, () => {
+    console.log(`[Engine] Running on port ${config.port}`);
+  });
+};
+
+start().catch(err => {
+  console.error('[Engine] Failed to start:', err);
+  process.exit(1);
+});