refactor: remove obsolete member management API module

apps/web/app/[locale]/home/[account]/courses/[courseId]/edit/page.tsx

@@ -25,7 +25,7 @@ export default async function EditCoursePage({ params }: PageProps) {
   if (!acct) return <AccountNotFound />;
 
   const api = createCourseManagementApi(client);
-  const course = await api.getCourse(courseId);
+  const course = await api.courses.getById(courseId);
   if (!course) return <AccountNotFound />;
 
   const c = course as Record<string, unknown>;