Add news feature with CRUD operations and real-time notifications

- Implemented news management functionality, allowing admins to create, read, update, and delete news posts.
- Introduced a new SignalR event for broadcasting news updates to all connected clients.
- Updated API documentation to include new endpoints for news management.
- Enhanced frontend with a dedicated news page and admin interface for managing news posts.
- Added necessary localization for news-related terms in both Russian and English.

frontend/src/routes/news.tsx

@@ -0,0 +1,22 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { useTranslation } from 'react-i18next'
+import { useRequireAuth } from '@/features/auth/guards'
+import { NewsFeed } from '@/features/news/NewsFeed'
+
+export const Route = createFileRoute('/news')({ component: NewsPage })
+
+function NewsPage() {
+  const { t } = useTranslation()
+  const { isReady } = useRequireAuth()
+
+  if (!isReady) return null
+
+  return (
+    <div className="mx-auto flex w-full max-w-4xl flex-col gap-8 px-6 py-10">
+      <div>
+        <h1 className="text-2xl font-semibold tracking-tight">{t('news.title')}</h1>
+      </div>
+      <NewsFeed />
+    </div>
+  )
+}