Refactor code structure and remove redundant changes

src-old/components/admin/MarkdownEditorLazy.tsx

@@ -0,0 +1,23 @@
+import { lazy, Suspense } from 'react';
+import { EditorSkeleton } from '@/components/loading/PageSkeletons';
+
+const MarkdownEditor = lazy(() => 
+  import('./MarkdownEditor').then(module => ({ default: module.MarkdownEditor }))
+);
+
+export interface MarkdownEditorProps {
+  value: string;
+  onChange: (value: string) => void;
+  onSave?: (value: string) => Promise<void>;
+  autoSave?: boolean;
+  height?: number;
+  placeholder?: string;
+}
+
+export function MarkdownEditorLazy(props: MarkdownEditorProps): React.JSX.Element {
+  return (
+    <Suspense fallback={<EditorSkeleton />}>
+      <MarkdownEditor {...props} />
+    </Suspense>
+  );
+}