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/PaymentSuccessPage.test.tsx

@@ -3,8 +3,8 @@ import { screen } from '@testing-library/react';
 import { renderWithProviders } from '../test/utils';
 
 const navSpy = vi.fn();
-vi.mock('react-router-dom', async (orig) => ({
-  ...(await orig<typeof import('react-router-dom')>()),
+vi.mock('react-router', async (orig) => ({
+  ...(await orig<typeof import('react-router')>()),
   useNavigate: () => navSpy,
 }));
 vi.mock('sonner', () => ({ toast: { success: vi.fn(), error: vi.fn() } }));