fix: 统一文档解析文件格式校验

- 统一知识库和工作流支持格式并增加前后端上传拦截

- 拒绝 XLS 与伪装 XLSX，避免空内容解析成功

easyflow-ui-admin/app/src/components/upload/DragFileUpload.vue

@@ -10,6 +10,7 @@ import { useAccessStore } from '@easyflow/stores';
 import { UploadFilled } from '@element-plus/icons-vue';
 import { ElIcon, ElMessage, ElUpload } from 'element-plus';
 
+import { DocumentParseFilePolicy } from '#/utils/document-parse-file-policy';
 import {
   normalizeUploadError,
   resolveUploadPath,
@@ -28,7 +29,6 @@ const props = defineProps({
 
 const emit = defineEmits(['success', 'error', 'onChange']);
 const MAX_FILE_SIZE_BYTES = 100 * 1024 * 1024;
-const ACCEPTED_FILE_TYPES = '.txt,.pdf,.docx,.md,.pptx,.xlsx';
 const accessStore = useAccessStore();
 const headers = ref({
   'easyflow-token': accessStore.accessToken,
@@ -54,12 +54,18 @@ const handleError: UploadProps['onError'] = (error) => {
   emit('error', normalizedError);
 };
 
-const beforeUpload: UploadProps['beforeUpload'] = (rawFile) => {
-  if (rawFile.size <= MAX_FILE_SIZE_BYTES) {
-    return true;
+const beforeUpload: UploadProps['beforeUpload'] = async (rawFile) => {
+  try {
+    await DocumentParseFilePolicy.validateFiles([rawFile]);
+  } catch (error: any) {
+    ElMessage.warning(error?.message || $t('message.notSupported'));
+    return false;
   }
-  ElMessage.warning($t('message.upload.fileTooLarge'));
-  return false;
+  if (rawFile.size > MAX_FILE_SIZE_BYTES) {
+    ElMessage.warning($t('message.upload.fileTooLarge'));
+    return false;
+  }
+  return true;
 };
 
 // 文件状态变化回调
@@ -97,7 +103,7 @@ defineExpose({
     drag
     :headers="headers"
     :action="`${apiURL}${props.action}`"
-    :accept="ACCEPTED_FILE_TYPES"
+    :accept="DocumentParseFilePolicy.accept"
     :before-upload="beforeUpload"
     :on-success="handleSuccess"
     :on-error="handleError"
@@ -111,7 +117,9 @@ defineExpose({
     <div class="flex flex-col gap-1">
       <span class="text-base">{{ $t('message.upload.title') }}</span>
       <span class="text-muted-foreground text-sm">{{
-        $t('message.upload.description')
+        $t('message.upload.description', {
+          types: DocumentParseFilePolicy.supportedTypeLabel,
+        })
       }}</span>
     </div>
   </ElUpload>