feat: монорепо миграция, Discover/SearxNG улучшения

- Миграция на монорепозиторий (apps/frontend, apps/chat-service, etc.)
- Discover: проверка SearxNG, понятное empty state при ненастроенном поиске
- searxng.ts: валидация URL, проверка JSON-ответа, авто-добавление http://
- docker/searxng-config: настройки для JSON API SearxNG

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/frontend/src/components/NewsArticleWidget.tsx

@@ -0,0 +1,71 @@
+import { useEffect, useState } from 'react';
+
+interface Article {
+  title: string;
+  content: string;
+  url: string;
+  thumbnail: string;
+}
+
+const NewsArticleWidget = () => {
+  const [article, setArticle] = useState<Article | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(false);
+
+  useEffect(() => {
+    fetch('/api/discover?mode=preview')
+      .then((res) => res.json())
+      .then((data) => {
+        const articles = (data.blogs || []).filter((a: Article) => a.thumbnail);
+        setArticle(articles[Math.floor(Math.random() * articles.length)]);
+        setLoading(false);
+      })
+      .catch(() => {
+        setError(true);
+        setLoading(false);
+      });
+  }, []);
+
+  return (
+    <div className="bg-light-secondary dark:bg-dark-secondary rounded-2xl border border-light-200 dark:border-dark-200 shadow-sm shadow-light-200/10 dark:shadow-black/25 flex flex-row items-stretch w-full h-24 min-h-[96px] max-h-[96px] p-0 overflow-hidden">
+      {loading ? (
+        <div className="animate-pulse flex flex-row items-stretch w-full h-full">
+          <div className="w-24 min-w-24 max-w-24 h-full bg-light-200 dark:bg-dark-200" />
+          <div className="flex flex-col justify-center flex-1 px-3 py-2 gap-2">
+            <div className="h-4 w-3/4 rounded bg-light-200 dark:bg-dark-200" />
+            <div className="h-3 w-1/2 rounded bg-light-200 dark:bg-dark-200" />
+          </div>
+        </div>
+      ) : error ? (
+        <div className="w-full text-xs text-red-400">Could not load news.</div>
+      ) : article ? (
+        <a
+          href={`/?q=Summary: ${article.url}`}
+          className="flex flex-row items-stretch w-full h-full relative overflow-hidden group"
+        >
+          <div className="relative w-24 min-w-24 max-w-24 h-full overflow-hidden">
+            <img
+              className="object-cover w-full h-full bg-light-200 dark:bg-dark-200 group-hover:scale-110 transition-transform duration-300"
+              src={
+                new URL(article.thumbnail).origin +
+                new URL(article.thumbnail).pathname +
+                `?id=${new URL(article.thumbnail).searchParams.get('id')}`
+              }
+              alt={article.title}
+            />
+          </div>
+          <div className="flex flex-col justify-center flex-1 px-3 py-2">
+            <div className="font-semibold text-xs text-black dark:text-white leading-tight line-clamp-2 mb-1">
+              {article.title}
+            </div>
+            <p className="text-black/60 dark:text-white/60 text-[10px] leading-relaxed line-clamp-2">
+              {article.content}
+            </p>
+          </div>
+        </a>
+      ) : null}
+    </div>
+  );
+};
+
+export default NewsArticleWidget;