feat(data-process): 启用智能文档清理预览

frontend/src/views/data-process/DataProcessCreateView.vue

@@ -57,7 +57,7 @@ const generationModels = computed(() => modelList.value)
 const taskSetupRef = ref<InstanceType<typeof TaskSetupStep>>()
 const modelSelectionRef = ref<InstanceType<typeof ModelSelectionStep>>()
 const confirmDialogRef = ref<InstanceType<typeof AppConfirmDialog>>()
-const PREVIEW_MODEL_VERSION = 'backend-pipeline-v3'
+const PREVIEW_MODEL_VERSION = 'backend-pipeline-v4'
 const WIZARD_STEPS = [
   { id: 'create', title: '创建任务', desc: '填写任务信息与处理配置' },
   { id: 'model', title: '大模型选择', desc: '选择生成模型并设置输出要求' },

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

@@ -128,7 +128,7 @@ defineExpose({ revealValidation })
         />
         <span class="preprocess-option-copy">
           <strong>智能预处理</strong>
-          <small>清理无效内容、感知文档结构、合并短块、预过滤低质量内容、近重复去重，并通过重叠保护上下文</small>
+          <small>清理页眉页脚、页码、目录和无效内容，感知文档结构、合并短块、预过滤低质量内容、近重复去重，并通过重叠保护上下文</small>
         </span>
       </label>