refactor(frontend): Remove '/api' prefix from all API calls to align with backend URL convention

- Updated all API endpoint strings in 'frontend/src' (via sed and manual fixes) to remove the '/api/' prefix.
- Manually fixed 'Timeline.tsx' absolute URLs to use the 'api' subdomain and correct path.
- Manually fixed 'useAuth.ts' logout fetch URLs.
- Updated 'HelpApiDocs.tsx' sandbox URL.
- This change, combined with the backend URL update, fully transitions the application to use subdomain-based routing (e.g., 'http://api.lvh.me:8000/resource/') instead of path-prefix routing (e.g., 'http://api.lvh.me:8000/api/resource/').

frontend/src/components/DevQuickLogin.tsx

@@ -89,7 +89,7 @@ export function DevQuickLogin({ embedded = false }: DevQuickLoginProps) {
     setLoading(user.username);
     try {
       // Call token auth API
-      const response = await apiClient.post('/api/auth-token/', {
+      const response = await apiClient.post('/auth-token/', {
         username: user.username,
         password: user.password,
       });
@@ -98,7 +98,7 @@ export function DevQuickLogin({ embedded = false }: DevQuickLoginProps) {
       setCookie('access_token', response.data.token, 7);
 
       // Fetch user data to determine redirect
-      const userResponse = await apiClient.get('/api/auth/me/');
+      const userResponse = await apiClient.get('/auth/me/');
       const userData = userResponse.data;
 
       // Determine the correct subdomain based on user role