feat: 完成数据处理接口与前端接入

frontend/src/views/data-process/create/PreviewCompareStep.vue

@@ -17,6 +17,8 @@ const emit = defineEmits<{
   'update:selectedId': [value: string]
   'update:selectedFileId': [value: string]
   'update:item-content': [id: string, value: string]
+  'restore:item': [id: string]
+  'add:item': []
   'remove:item': [id: string]
 }>()
 
@@ -71,6 +73,12 @@ function saveEditor() {
   closeEditor()
 }
 
+function restoreItem() {
+  if (!editingItem.value) return
+  emit('restore:item', editingItem.value.id)
+  closeEditor()
+}
+
 function removeItem(item: PreviewItem) {
   selectItem(item.id)
   emit('remove:item', item.id)
@@ -169,7 +177,12 @@ function lineRange(item: PreviewItem) {
       <div class="preview-pane">
         <div class="pane-header">
           <strong>{{ processType === 'unstructured' ? '切片内容' : '记录内容' }}</strong>
-          <span>共 {{ items.length.toLocaleString() }} 条</span>
+          <div class="pane-header-actions">
+            <span>共 {{ items.length.toLocaleString() }} 条</span>
+            <el-button link type="primary" @click="emit('add:item')">
+              <i class="fa fa-plus" /> 手动新增
+            </el-button>
+          </div>
         </div>
 
         <template v-if="!editingItem">
@@ -234,6 +247,13 @@ function lineRange(item: PreviewItem) {
             resize="none"
           />
           <div class="editor-actions">
+            <el-button
+              v-if="editingItem.sourceStart != null"
+              link
+              @click="restoreItem"
+            >
+              <i class="fa fa-undo" /> 恢复原始内容
+            </el-button>
             <div>
               <el-button @click="closeEditor">取消</el-button>
               <el-button type="primary" @click="saveEditor">保存修改</el-button>
@@ -288,6 +308,17 @@ function lineRange(item: PreviewItem) {
   white-space: nowrap;
 }
 
+.pane-header-actions {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+
+  > span {
+    color: #8a93a3;
+    font-size: 11px;
+  }
+}
+
 .file-option {
   display: grid;
   grid-template-columns: minmax(0, 1fr) auto auto;