fix: 添加 blocks 响应式变量，修复编辑页面空白问题

frontend/vue-demo/src/views/Editor.vue

@@ -492,6 +492,9 @@ const newSourceFile = reactive({
   required: true
 })
 
+// 文档结构块（用于生成目录等）
+const blocks = ref([])
+
 // 目录数据（从文档结构中提取）
 const tocItems = computed(() => {
   const items = []
@@ -761,19 +764,23 @@ async function fetchTemplateData() {
         const structuredDoc = await documentApi.getStructured(baseDocumentId)
         // 将结构化文档的 blocks 和 images 合并渲染
         if (structuredDoc && structuredDoc.blocks && structuredDoc.blocks.length > 0) {
+          blocks.value = structuredDoc.blocks // 保存 blocks 用于目录
           documentContent.value = renderStructuredDocument(structuredDoc)
           // 提取文档中的实体
           entities.value = extractEntitiesFromBlocks(structuredDoc.blocks)
         } else {
+          blocks.value = []
           documentContent.value = emptyPlaceholder
           entities.value = []
         }
       } catch (docError) {
         console.warn('获取文档内容失败:', docError)
+        blocks.value = []
         documentContent.value = emptyPlaceholder
         entities.value = []
       }
     } else {
+      blocks.value = []
       documentContent.value = emptyPlaceholder
       entities.value = []
     }
@@ -1434,6 +1441,7 @@ async function handleRegenerateBlocks() {
     // 重新加载文档内容
     const structuredDoc = await documentApi.getStructured(baseDocumentId)
     if (structuredDoc && structuredDoc.blocks && structuredDoc.blocks.length > 0) {
+      blocks.value = structuredDoc.blocks // 更新 blocks
       documentContent.value = renderStructuredDocument(structuredDoc)
       // 重新提取实体
       entities.value = extractEntitiesFromBlocks(structuredDoc.blocks)