feat: add BlogBodySanitizer for HTML sanitization on article save

- Implemented BlogBodySanitizer to clean HTML content before saving articles, ensuring security against XSS attacks.
- Added tests for BlogBodySanitizer to verify that unsafe tags and attributes are stripped from the content.
- Introduced ApiLeastPrivilegeTest to ensure that unauthorized users cannot access sensitive API routes, maintaining strict access control.

assets/admin/pages/BlogFormPage.test.tsx

@@ -1,7 +1,7 @@
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
-import { Routes, Route } from 'react-router-dom';
+import { Routes, Route } from 'react-router';
 import { renderWithProviders } from '@/test/utils';
 
 vi.mock('@ckeditor/ckeditor5-react', () => ({ CKEditor: () => null }));