Refactor frontend structure and update dependencies

- Changed the main entry point from main.jsx to main.tsx for TypeScript support.
- Removed Tabler JS import and integrated Tailwind CSS for styling.
- Updated package.json and package-lock.json to include new dependencies such as @fontsource-variable/geist and tailwindcss, while removing unused ones.
- Enhanced Vite configuration with path aliasing for improved import management.
- Deleted unused App.css and App.jsx files to streamline the project structure.

Made-with: Cursor

frontend/src/MikrotikBackupsManager.jsx

@@ -6,7 +6,7 @@ import PageHeader from './components/PageHeader.jsx';
 import TableSkeleton from './components/TableSkeleton.jsx';
 import EmptyState from './components/EmptyState.jsx';
 import Tooltip from './components/Tooltip.jsx';
-import DataTable from './components/DataTable.jsx';
+import { DataTable } from '@/components/shared/table';
 import { LargeModal, FullscreenModal } from './components/Modal.jsx';
 import { countryToFlag } from './utils/serverUtils.js';
 import {
@@ -17,7 +17,7 @@ import {
   IconDownload,
   IconCopy,
   IconSearch,
-} from '@tabler/icons-react';
+} from '@/lib/icons';
 
 /**
  * Строит две колонки строк для side-by-side diff (как git diff).