Initial commit: TopSysOps site + admin panel

Multi-page public site (Next.js), Node/Express backend with Postgres,
and Vite admin/account app, restructured from a single-page layout
into dedicated service, promotions, cases, about, FAQ, and blog pages
for SEO.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013otXCiTZsxdZ4SJKZ9wUky

public-site/components/SupportChat.jsx

@@ -0,0 +1,53 @@
+'use client';
+
+import { useEffect } from 'react';
+
+// Провайдер и адреса задаются на этапе сборки через переменные NEXT_PUBLIC_*
+// (см. корневой .env и docker-compose.yml -> nextjs -> build.args). Смена
+// провайдера требует пересборки: docker compose up -d --build nextjs.
+const PROVIDER = process.env.NEXT_PUBLIC_CHAT_PROVIDER || 'none';
+
+function loadTopTicket() {
+  // TopTicket - собственная разработка компании. Embed-сниппет вида:
+  // <script src="https://help.top-sysops.ru/widget.js" data-key="..." async></script>
+  const widgetUrl = process.env.NEXT_PUBLIC_TOPTICKET_WIDGET_URL;
+  const widgetKey = process.env.NEXT_PUBLIC_TOPTICKET_WIDGET_KEY;
+  if (!widgetUrl || !widgetKey) return undefined;
+
+  const script = document.createElement('script');
+  script.src = widgetUrl;
+  script.setAttribute('data-key', widgetKey);
+  script.async = true;
+  document.body.appendChild(script);
+
+  return () => script.remove();
+}
+
+function loadChatwoot() {
+  const baseUrl = process.env.NEXT_PUBLIC_CHATWOOT_BASE_URL;
+  const token = process.env.NEXT_PUBLIC_CHATWOOT_WEBSITE_TOKEN;
+  if (!baseUrl || !token) return undefined;
+
+  const script = document.createElement('script');
+  script.src = `${baseUrl.replace(/\/$/, '')}/packs/js/sdk.js`;
+  script.defer = true;
+  script.async = true;
+  script.onload = () => {
+    if (window.chatwootSDK) {
+      window.chatwootSDK.run({ websiteToken: token, baseUrl });
+    }
+  };
+  document.body.appendChild(script);
+
+  return () => script.remove();
+}
+
+export default function SupportChat() {
+  useEffect(() => {
+    if (PROVIDER === 'topticket') return loadTopTicket();
+    if (PROVIDER === 'chatwoot') return loadChatwoot();
+    return undefined;
+  }, []);
+
+  return null;
+}