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/workers/generation.js

@@ -0,0 +1,57 @@
+const Queue = require('bull');
+const config = require('../config');
+const ai = require('../services/ai');
+const { query } = require('../config/db');
+
+const generationQueue = new Queue('generation', {
+  redis: config.redis,
+  defaultJobOptions: {
+    attempts: 3,
+    backoff: { type: 'exponential', delay: 5000 },
+    removeOnComplete: 100,
+    removeOnFail: 200,
+  },
+});
+
+generationQueue.process(async (job) => {
+  const { jobId, type, topic, tone, language, channelContext, keywords } = job.data;
+
+  await query(`UPDATE generation_jobs SET status='processing', updated_at=NOW() WHERE id=$1`, [jobId]);
+
+  try {
+    let result;
+    if (type === 'post') {
+      result = await ai.generatePost({ topic, tone, language, channelContext });
+    } else if (type === 'article') {
+      result = await ai.generateArticle({ topic, language, keywords });
+    } else if (type === 'topics') {
+      const topics = await ai.generateTopics({ channelContext: topic, language });
+      result = JSON.stringify(topics);
+    } else {
+      throw new Error(`Unknown job type: ${type}`);
+    }
+
+    await query(
+      `UPDATE generation_jobs SET status='done', result=$1, updated_at=NOW() WHERE id=$2`,
+      [result, jobId]
+    );
+
+    console.log(`[Worker] Job ${jobId} (${type}) done`);
+    return { jobId, result };
+
+  } catch (err) {
+    await query(
+      `UPDATE generation_jobs SET status='failed', error=$1, updated_at=NOW() WHERE id=$2`,
+      [err.message, jobId]
+    );
+    throw err;
+  }
+});
+
+generationQueue.on('failed', (job, err) => {
+  console.error(`[Worker] Job ${job.data.jobId} failed:`, err.message);
+});
+
+console.log('[Worker] Generation queue started');
+
+module.exports = generationQueue;