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/config/index.js

@@ -0,0 +1,18 @@
+require('dotenv').config();
+
+module.exports = {
+  port: process.env.PORT || 3030,
+  anthropicApiKey: process.env.ANTHROPIC_API_KEY,
+  db: {
+    host: process.env.DB_HOST || 'localhost',
+    port: process.env.DB_PORT || 5432,
+    database: process.env.DB_NAME || 'zeropost',
+    user: process.env.DB_USER || 'postgres',
+    password: process.env.DB_PASS || 'postgres',
+  },
+  redis: {
+    host: process.env.REDIS_HOST || 'localhost',
+    port: process.env.REDIS_PORT || 6379,
+  },
+  internalSecret: process.env.INTERNAL_SECRET || 'dev-secret-change-in-prod',
+};