feat: серии + count-up в Stats

- SeriesGrid: карточки серий с иконками (Sparkles/Plug/Zap/Layers) и цветовыми темами
- /series/[slug]: страница серии с интро и сеткой статей в порядке из article_ids
- Stats: count-up анимация (easeOutQuart 1.2s) при появлении в viewport через IntersectionObserver
- sitemap.xml: добавлены /notes и все серии

app/page.js

@@ -6,21 +6,23 @@ import HeroImage from '@/components/HeroImage';
 import Stats from '@/components/Stats';
 import NowBlock from '@/components/NowBlock';
 import NotesBlock from '@/components/NotesBlock';
+import SeriesGrid from '@/components/SeriesGrid';
 import Reveal from '@/components/Reveal';
-import { listArticles, listTags, getStats, getLive, listNotes } from '@/lib/engine';
+import { listArticles, listTags, getStats, getLive, listNotes, listSeries } from '@/lib/engine';
 import { Sparkles, ArrowRight } from 'lucide-react';
 
 export const dynamic = 'force-dynamic';
 
 export default async function HomePage() {
-  let articles = [], tags = [], stats = null, live = null, notes = [];
+  let articles = [], tags = [], stats = null, live = null, notes = [], series = [];
   try {
-    [articles, tags, stats, live, notes] = await Promise.all([
+    [articles, tags, stats, live, notes, series] = await Promise.all([
       listArticles({ limit: 13 }),
       listTags(),
       getStats(),
       getLive(),
       listNotes({ limit: 6 }),
+      listSeries(),
     ]);
   } catch (err) {
     console.error('Home load failed:', err.message);
@@ -88,6 +90,15 @@ export default async function HomePage() {
         </Reveal>
       )}
 
+      {/* Серии */}
+      {series.length > 0 && (
+        <Reveal>
+          <div className="reveal">
+            <SeriesGrid series={series} />
+          </div>
+        </Reveal>
+      )}
+
       {/* Rest */}
       {rest.length > 0 && (
         <Reveal>