feat: AI-генерация обложек + /api/stats + раздача /uploads

- services/covers.js: gpt-image-1, фиксированный стиль emerald-geometric, fallback на ошибки шлюза
- articles.generateAndSaveArticle: запускает обложку в setImmediate (не блокирует ответ)
- routes/articles: POST /backfill-covers для досгенерации
- routes/stats: статистика блога (статьи, слова, токены, просмотры)
- index.js: express.static на /uploads БЕЗ авторизации (публичные картинки)

src/routes/articles.js

@@ -49,4 +49,17 @@ router.post('/generate', async (req, res) => {
   }
 });
 
+
+// POST /api/articles/backfill-covers — досгенерировать обложки для статей без них
+router.post('/backfill-covers', async (req, res) => {
+  try {
+    const covers = require('../services/covers');
+    const limit = parseInt(req.body?.limit) || 3;
+    const result = await covers.backfillCovers({ limit });
+    res.json(result);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
 module.exports = router;

src/routes/stats.js

@@ -0,0 +1,39 @@
+const express = require('express');
+const router = express.Router();
+const { query } = require('../config/db');
+
+// GET /api/stats — публичная статистика блога
+router.get('/', async (_, res) => {
+  try {
+    const { rows: countRow } = await query(
+      `SELECT
+         COUNT(*)::int as articles_count,
+         COALESCE(SUM(LENGTH(content) - LENGTH(REPLACE(content, ' ', '')) + 1), 0)::int as total_words,
+         COALESCE(SUM(reading_time), 0)::int as total_reading_min,
+         COALESCE(SUM(views), 0)::int as total_views
+       FROM articles WHERE status='published'`
+    );
+
+    const { rows: jobsRow } = await query(
+      `SELECT
+         COALESCE(SUM(tokens_in), 0)::int as tokens_in,
+         COALESCE(SUM(tokens_out), 0)::int as tokens_out,
+         COUNT(*)::int as jobs_done
+       FROM generation_jobs WHERE status='done' AND type='article'`
+    );
+
+    const { rows: latestRow } = await query(
+      `SELECT MAX(published_at) as latest FROM articles WHERE status='published'`
+    );
+
+    res.json({
+      ...countRow[0],
+      ...jobsRow[0],
+      latest_published: latestRow[0]?.latest || null,
+    });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+module.exports = router;

src/services/articles.js

@@ -1,5 +1,6 @@
 const { query } = require('../config/db');
 const ai = require('./ai');
+const covers = require('./covers');
 
 /**
  * Slug из заголовка — транслит для русского.
@@ -132,6 +133,15 @@ async function generateAndSaveArticle({ topic, keywords = [], tags = [], autoPub
       [content, articleRes.usage?.prompt_tokens, articleRes.usage?.completion_tokens, jobId]
     );
 
+    // Фоновая генерация обложки — не блокирует возврат статьи
+    setImmediate(() => {
+      covers.generateCover({
+        articleId: artRows[0].id,
+        title: artRows[0].title,
+        tags: artRows[0].tags || [],
+      }).catch(err => console.warn('[Article] cover bg failed:', err.message.slice(0,200)));
+    });
+
     return artRows[0];
   } catch (err) {
     await query(

src/services/covers.js

@@ -0,0 +1,107 @@
+const fs = require('fs');
+const path = require('path');
+const axios = require('axios');
+const config = require('../config');
+const { query } = require('../config/db');
+
+const UPLOADS_DIR = process.env.UPLOADS_DIR || '/var/www/zeropost-uploads';
+
+// Гарантируем что директория есть
+if (!fs.existsSync(UPLOADS_DIR)) {
+  fs.mkdirSync(UPLOADS_DIR, { recursive: true });
+}
+
+/**
+ * Генерирует промпт для обложки на основе темы и тегов.
+ * Стиль фиксированный — абстрактная геометрия в emerald-палитре.
+ */
+function buildCoverPrompt({ title, tags = [] }) {
+  const subject = title.replace(/[«»":?!.]/g, '').slice(0, 80);
+  const tagHint = tags.slice(0, 2).join(', ');
+  return `Abstract minimalist editorial cover illustration for an article titled "${subject}".
+Style: flat geometric shapes, smooth flowing curves, isometric or layered planes.
+Color palette: emerald green (#10b981, #34d399), soft teal, warm off-white background (#fafaf9), subtle dark accents.
+Mood: clean, modern, calm, intellectual.
+Composition: balanced, plenty of negative space, no text, no letters, no people, no logos.
+${tagHint ? `Theme cues: ${tagHint}.` : ''}
+High quality vector-like editorial illustration in the style of Stripe Press, Linear, Notion blog covers.`;
+}
+
+/**
+ * Запрашивает картинку у gpt-image модели, сохраняет файл локально.
+ * Возвращает публичный URL.
+ */
+async function generateCover({ articleId, title, tags = [] }) {
+  const prompt = buildCoverPrompt({ title, tags });
+  const model = config.ai.models.image || 'gpt-image-1';
+
+  let imgData;
+  try {
+    const res = await axios.post(
+      `${config.ai.baseUrl}/images/generations`,
+      {
+        model,
+        prompt,
+        n: 1,
+        size: '1536x1024',
+      },
+      {
+        headers: { Authorization: `Bearer ${config.ai.imageApiKey}` },
+        timeout: 120000,
+      }
+    );
+    imgData = res.data.data?.[0];
+  } catch (err) {
+    const msg = err.response?.data?.error?.message || err.message;
+    console.warn(`[Cover] generation failed for article ${articleId}:`, msg.slice(0, 200));
+    throw new Error(msg);
+  }
+
+  if (!imgData) throw new Error('Empty image response');
+
+  // Получаем bytes — либо из b64, либо скачиваем по URL
+  let bytes;
+  if (imgData.b64_json) {
+    bytes = Buffer.from(imgData.b64_json, 'base64');
+  } else if (imgData.url) {
+    const resp = await axios.get(imgData.url, { responseType: 'arraybuffer', timeout: 60000 });
+    bytes = Buffer.from(resp.data);
+  } else {
+    throw new Error('No image data in response');
+  }
+
+  const filename = `cover-${articleId}-${Date.now()}.png`;
+  const filepath = path.join(UPLOADS_DIR, filename);
+  fs.writeFileSync(filepath, bytes);
+
+  const publicUrl = `/uploads/${filename}`;
+  await query(`UPDATE articles SET cover_url=$1, updated_at=NOW() WHERE id=$2`, [publicUrl, articleId]);
+
+  console.log(`[Cover] saved ${publicUrl} (${(bytes.length / 1024).toFixed(0)} KB)`);
+  return publicUrl;
+}
+
+/**
+ * Дофоновая попытка сгенерировать обложки для статей без cover_url.
+ * Запускается периодически — если шлюз картинок снова доступен, всё подтянется.
+ */
+async function backfillCovers({ limit = 3 } = {}) {
+  const { rows } = await query(
+    `SELECT id, title, tags FROM articles
+     WHERE cover_url IS NULL AND status='published'
+     ORDER BY published_at DESC LIMIT $1`,
+    [limit]
+  );
+  let ok = 0, fail = 0;
+  for (const a of rows) {
+    try {
+      await generateCover({ articleId: a.id, title: a.title, tags: a.tags || [] });
+      ok++;
+    } catch {
+      fail++;
+    }
+  }
+  return { processed: rows.length, ok, fail };
+}
+
+module.exports = { generateCover, backfillCovers, buildCoverPrompt, UPLOADS_DIR };