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/DashboardPage.test.tsx

@@ -8,8 +8,8 @@ vi.mock('../lib/api', () => ({
 }));
 
 const navigate = vi.fn();
-vi.mock('react-router-dom', async () => ({
-  ...(await vi.importActual<typeof import('react-router-dom')>('react-router-dom')),
+vi.mock('react-router', async () => ({
+  ...(await vi.importActual<typeof import('react-router')>('react-router')),
   useNavigate: () => navigate,
 }));