레거시 본문 저장 형식 정규화

components/admin/AdminMarkdownEditor.vue

@@ -1,7 +1,9 @@
 <script setup>
+import { normalizeMarkdownContent } from '../../lib/markdown-content-normalizer.js'
+
 const props = defineProps({
   modelValue: {
-    type: String,
+    type: [String, Array, Object],
     default: ''
   }
 })
@@ -30,7 +32,7 @@ const imageWidthOptions = [
 ]
 
 const markdownValue = computed({
-  get: () => props.modelValue || '',
+  get: () => normalizeMarkdownContent(props.modelValue),
   set: (value) => emit('update:modelValue', value)
 })