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/components/ui/BackButton.test.tsx

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { screen, fireEvent, render } from '@testing-library/react';
-import { MemoryRouter, Route, Routes, Link } from 'react-router-dom';
+import { MemoryRouter, Route, Routes, Link } from 'react-router';
 import BackButton from './BackButton';
 import PageHeader from './PageHeader';