feat: 支持知识库 CSV 大文件导入

- 增加 CSV 流式解析、表格语义分块和分页预览

- 增加快照两阶段清理、失败重试和格式校验

- 补充批量入口、管理端交互和回归测试

easyflow-ui-admin/app/src/views/ai/documentCollection/SegmenterDoc.vue

@@ -49,6 +49,8 @@ interface PreviewItem {
   chunks?: ChunkItem[];
   fileName: string;
   normalizedContent?: string;
+  pageNo?: number;
+  pageSize?: number;
   previewSessionId: string;
   strategyCode?: string;
   strategyLabel?: string;
@@ -97,6 +99,7 @@ const activeDocumentId = ref(props.documentId || '');
 const previewError = ref('');
 const previewLoading = ref(false);
 const startLoading = ref(false);
+const previewPageSize = 20;
 let previewDebounceTimer: null | ReturnType<typeof setTimeout> = null;
 let previewSequence = 0;
 
@@ -137,7 +140,9 @@ const fileExt = computed(
 
 const isPptx = computed(() => fileExt.value === 'pptx');
 const isXlsx = computed(() => fileExt.value === 'xlsx');
-const showStrategySelector = computed(() => !isPptx.value && !isXlsx.value);
+const isCsv = computed(() => fileExt.value === 'csv');
+const isTabular = computed(() => isXlsx.value || isCsv.value);
+const showStrategySelector = computed(() => !isPptx.value && !isTabular.value);
 
 const mdLevels = [1, 2, 3, 4, 5, 6];
 
@@ -169,10 +174,10 @@ const buildStrategyConfig = () => {
       strategyCode: 'OFFICE_PPTX_PAGE',
     };
   }
-  if (isXlsx.value) {
+  if (isTabular.value) {
     return {
       rowsPerChunk: formState.rowsPerChunk,
-      strategyCode: 'OFFICE_XLSX_ROW_WINDOW',
+      strategyCode: isCsv.value ? 'TABLE_ROW' : 'OFFICE_XLSX_ROW_WINDOW',
     };
   }
   return {
@@ -233,6 +238,8 @@ const generatePreview = async () => {
           },
         ],
         knowledgeId: props.knowledgeId,
+        pageNo: 1,
+        pageSize: previewPageSize,
       },
     );
     if (requestSequence !== previewSequence) {
@@ -261,6 +268,52 @@ const generatePreview = async () => {
   }
 };
 
+const loadPreviewPage = async (pageNo: number) => {
+  if (
+    !activeDocumentId.value ||
+    !currentPreviewSessionId.value ||
+    previewLoading.value
+  ) {
+    return;
+  }
+  const requestSequence = ++previewSequence;
+  previewLoading.value = true;
+  previewError.value = '';
+  try {
+    const res = await props.requestClient.post(
+      buildKnowledgePath(
+        props.endpointPrefix,
+        '/api/v1/document/import/task/preview',
+      ),
+      {
+        documentId: activeDocumentId.value,
+        knowledgeId: props.knowledgeId,
+        pageNo,
+        pageSize: previewPageSize,
+        previewSessionId: currentPreviewSessionId.value,
+      },
+    );
+    if (requestSequence !== previewSequence) {
+      return;
+    }
+    previewItems.value = normalizePreviewItems(
+      (res.data?.items || []) as PreviewItem[],
+    );
+  } catch (error: any) {
+    if (requestSequence !== previewSequence) {
+      return;
+    }
+    const message =
+      error?.message || $t('documentCollection.importDoc.previewRequestFailed');
+    previewError.value = message;
+    ElMessage.error(message);
+  } finally {
+    if (requestSequence === previewSequence) {
+      previewLoading.value = false;
+    }
+  }
+};
+
 const schedulePreviewGeneration = () => {
   if (!activeDocumentId.value) {
     return;
@@ -321,8 +374,10 @@ watch(
     if (isPptx.value) {
       formState.strategyCode = 'OFFICE_PPTX_PAGE';
     }
-    if (isXlsx.value) {
-      formState.strategyCode = 'OFFICE_XLSX_ROW_WINDOW';
+    if (isTabular.value) {
+      formState.strategyCode = isCsv.value
+        ? 'TABLE_ROW'
+        : 'OFFICE_XLSX_ROW_WINDOW';
       formState.rowsPerChunk = 10;
     }
     resetPreviewState();
@@ -365,7 +420,7 @@ watch(
         </ElFormItem>
 
         <ElFormItem
-          v-if="isXlsx"
+          v-if="isTabular"
           label="每多少行分一块"
           class="workbench__form-full"
         >
@@ -450,6 +505,7 @@ watch(
       <SplitterDocPreview
         :loading="previewLoading"
         :preview-items="previewItems"
+        @page-change="loadPreviewPage"
         @preview-session-change="handlePreviewSessionChange"
       />
     </section>