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/hooks/useAuth.ts

@@ -95,8 +95,11 @@ export const useLogout = () => {
       queryClient.removeQueries({ queryKey: ['currentUser'] });
       queryClient.clear();
 
-      // Redirect to login page
-      window.location.href = '/login';
+      // Redirect to login page on root domain
+      const protocol = window.location.protocol;
+      const baseDomain = getBaseDomain();
+      const port = window.location.port ? `:${window.location.port}` : '';
+      window.location.href = `${protocol}//${baseDomain}${port}/login`;
     },
   });
 };
@@ -150,7 +153,7 @@ export const useMasquerade = () => {
         // Call logout API to clear HttpOnly sessionid cookie
         try {
           const apiUrl = import.meta.env.VITE_API_URL || `${window.location.protocol}//${baseDomain}`;
-          await fetch(`${apiUrl}/api/auth/logout/`, {
+          await fetch(`${apiUrl}/auth/logout/`, {
             method: 'POST',
             credentials: 'include',
           });
@@ -222,7 +225,7 @@ export const useStopMasquerade = () => {
         // CRITICAL: Clear the session cookie BEFORE redirect
         try {
           const apiUrl = import.meta.env.VITE_API_URL || `${window.location.protocol}//${baseDomain}`;
-          await fetch(`${apiUrl}/api/auth/logout/`, {
+          await fetch(`${apiUrl}/auth/logout/`, {
             method: 'POST',
             credentials: 'include',
           });