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/shared/ui/textarea.tsx

@@ -0,0 +1,16 @@
+import { type TextareaHTMLAttributes, forwardRef } from 'react'
+import { cn } from '@/shared/lib/cn'
+
+export const Textarea = forwardRef<HTMLTextAreaElement, TextareaHTMLAttributes<HTMLTextAreaElement>>(
+  ({ className, ...props }, ref) => (
+    <textarea
+      className={cn(
+        'flex min-h-32 w-full rounded-md border border-border bg-transparent px-3 py-2 text-sm outline-none transition-colors placeholder:text-muted-foreground focus-visible:ring-2 focus-visible:ring-primary/50 disabled:cursor-not-allowed disabled:opacity-50',
+        className,
+      )}
+      ref={ref}
+      {...props}
+    />
+  ),
+)
+Textarea.displayName = 'Textarea'