Add Telegram bot integration and related features

Implemented Telegram bot functionality, including settings management, subscriber tracking, and link generation for user interaction. Updated the backend to support new Telegram-related services and database entities. Enhanced the frontend to display Telegram options and allow users to open a chat with the bot. Localization strings were added for both English and Russian to support the new features. This integration aims to improve user engagement through Telegram notifications and interactions.

frontend/src/routes/admin.tsx

@@ -113,6 +113,13 @@ function AdminLayout() {
         >
           {t('admin.maintenance.title')}
         </Link>
+        <Link
+          to="/admin/telegram"
+          className={cn('pb-2 uppercase tracking-wide text-muted-foreground hover:text-foreground')}
+          activeProps={{ className: 'border-b-2 border-primary text-primary' }}
+        >
+          {t('admin.telegram.title')}
+        </Link>
         <Link
           to="/admin/settings"
           className={cn('pb-2 uppercase tracking-wide text-muted-foreground hover:text-foreground')}

frontend/src/routes/admin/telegram.tsx

@@ -0,0 +1,4 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { TelegramPanel } from '@/features/admin/telegram/TelegramPanel'
+
+export const Route = createFileRoute('/admin/telegram')({ component: TelegramPanel })