Refactor organization and user management components/tests for simplification and improved clarity

- Removed unused properties (`slug`, `is_active`, etc.) in organization and user-related components and test data.
- Simplified function data typing by removing redundant `any` usage.
- Updated `params` in `OrganizationMembersPage` for Promise resolution and async handling.
- Cleaned up unused variables and streamlined form handling in `AddMemberDialog`.

frontend/src/components/admin/organizations/OrganizationManagementContent.tsx

@@ -21,7 +21,6 @@ import { OrganizationFormDialog } from './OrganizationFormDialog';
 export function OrganizationManagementContent() {
   const router = useRouter();
   const searchParams = useSearchParams();
-  const { user: currentUser } = useAuth();
 
   // URL state
   const page = parseInt(searchParams.get('page') || '1', 10);