feat: categories table, API, category field in articles

src/routes/articles.js

@@ -57,7 +57,7 @@ router.get('/admin', async (req, res) => {
     const limit = Math.min(parseInt(req.query.limit) || 100, 200);
     const offset = parseInt(req.query.offset) || 0;
     const { rows } = await query(
-      `SELECT id, slug, title, excerpt, cover_url, tags, author, reading_time,
+      `SELECT id, slug, title, excerpt, cover_url, tags, category, author, reading_time,
               status, seo_title, seo_descr, views, published_at, created_at, updated_at
        FROM articles ORDER BY created_at DESC LIMIT $1 OFFSET $2`,
       [limit, offset]

src/routes/categories.js

@@ -0,0 +1,28 @@
+const express = require('express');
+const router = express.Router();
+const { query } = require('../config/db');
+
+// GET /api/categories
+router.get('/', async (_, res) => {
+  try {
+    const { rows } = await query('SELECT * FROM categories ORDER BY sort_order');
+    res.json(rows);
+  } catch (err) { res.status(500).json({ error: err.message }); }
+});
+
+// GET /api/categories/:slug/articles
+router.get('/:slug/articles', async (req, res) => {
+  try {
+    const limit = Math.min(parseInt(req.query.limit) || 20, 100);
+    const offset = parseInt(req.query.offset) || 0;
+    const { rows } = await query(
+      `SELECT id,slug,title,excerpt,cover_url,tags,category,author,reading_time,published_at
+       FROM articles WHERE status='published' AND category=$1
+       ORDER BY published_at DESC LIMIT $2 OFFSET $3`,
+      [req.params.slug, limit, offset]
+    );
+    res.json(rows);
+  } catch (err) { res.status(500).json({ error: err.message }); }
+});
+
+module.exports = router;

src/services/articles.js

@@ -31,14 +31,12 @@ function estimateReadingTime(text) {
 /**
  * Список опубликованных статей.
  */
-async function listArticles({ limit = 20, offset = 0, tag = null } = {}) {
-  let sql = `SELECT id, slug, title, excerpt, cover_url, tags, author, reading_time, published_at
+async function listArticles({ limit = 20, offset = 0, tag = null, category = null } = {}) {
+  let sql = `SELECT id, slug, title, excerpt, cover_url, tags, category, author, reading_time, published_at
              FROM articles WHERE status='published'`;
   const params = [];
-  if (tag) {
-    sql += ` AND tags ?? $${params.length + 1}`;
-    params.push(tag);
-  }
+  if (tag) { sql += ` AND tags ?? ${params.length + 1}`; params.push(tag); }
+  if (category) { sql += ` AND category=${params.length + 1}`; params.push(category); }
   sql += ` ORDER BY published_at DESC LIMIT $${params.length + 1} OFFSET $${params.length + 2}`;
   params.push(limit, offset);
   const { rows } = await query(sql, params);