fix: 修复学生导入上传认证失败的问题

使用自定义上传方法(http-request)替代原生action，
通过项目的request工具发送请求，自动走Vite代理并携带token

frontend/ruoyi-ui/src/views/business/student/components/ImportDialog.vue

@@ -30,12 +30,8 @@
 
     <el-upload
       ref="uploadRef"
-      :action="uploadUrl"
-      :headers="uploadHeaders"
+      :http-request="customUpload"
       :before-upload="beforeUpload"
-      :on-success="handleSuccess"
-      :on-error="handleError"
-      :on-progress="handleProgress"
       :show-file-list="true"
       :limit="1"
       accept=".xlsx,.xls"
@@ -85,8 +81,7 @@
  */
 import { Download, UploadFilled } from '@element-plus/icons-vue'
 import { ElMessage } from 'element-plus'
-import { computed, ref } from 'vue'
-import { getToken } from '@/utils/auth'
+import { ref } from 'vue'
 import request from '@/utils/request'
 
 const emit = defineEmits(['success'])
@@ -98,17 +93,6 @@ const downloadLoading = ref(false)
 const uploading = ref(false)
 const uploadProgress = ref(0)
 
-// 上传地址（使用完整路径）
-const uploadUrl = computed(() => {
-  return import.meta.env.VITE_APP_BASE_API + '/business/student/import'
-})
-
-// 上传请求头
-const uploadHeaders = computed(() => {
-  const token = getToken()
-  return token ? { Authorization: 'Bearer ' + token } : {}
-})
-
 // 下载模板
 const handleDownloadTemplate = async () => {
   downloadLoading.value = true
@@ -153,42 +137,58 @@ const beforeUpload = (file) => {
     return false
   }
   importResult.value = null
-  uploading.value = true
-  uploadProgress.value = 0
   return true
 }
 
-// 上传进度
-const handleProgress = (event) => {
-  uploadProgress.value = Math.round(event.percent)
-}
-
-// 上传成功
-const handleSuccess = (response) => {
-  uploading.value = false
+// 自定义上传（使用 request 走 Vite 代理，自动携带 token）
+const customUpload = async ({ file, onProgress, onSuccess, onError }) => {
+  uploading.value = true
   uploadProgress.value = 0
   
-  if (response.code === 200) {
-    importResult.value = response.data
-    if (response.data.failCount === 0) {
-      ElMessage.success(`导入成功，共导入 ${response.data.successCount} 条数据`)
-      emit('success')
+  const formData = new FormData()
+  formData.append('file', file)
+  
+  try {
+    const response = await request({
+      url: '/business/student/import',
+      method: 'post',
+      data: formData,
+      headers: {
+        'Content-Type': 'multipart/form-data'
+      },
+      onUploadProgress: (progressEvent) => {
+        const percent = Math.round((progressEvent.loaded / progressEvent.total) * 100)
+        uploadProgress.value = percent
+        onProgress({ percent })
+      }
+    })
+    
+    uploading.value = false
+    uploadProgress.value = 0
+    
+    // response 是 axios 解析后的数据
+    if (response.code === 200) {
+      importResult.value = response.data
+      if (response.data.failCount === 0) {
+        ElMessage.success(`导入成功，共导入 ${response.data.successCount} 条数据`)
+        emit('success')
+      } else {
+        ElMessage.warning('部分数据导入失败，请查看失败原因')
+      }
+      onSuccess(response)
     } else {
-      ElMessage.warning('部分数据导入失败，请查看失败原因')
+      ElMessage.error(response.msg || '导入失败')
+      onError(new Error(response.msg || '导入失败'))
     }
-  } else {
-    ElMessage.error(response.msg || '导入失败')
+  } catch (error) {
+    uploading.value = false
+    uploadProgress.value = 0
+    console.error('上传失败:', error)
+    ElMessage.error('文件上传失败，请重试')
+    onError(error)
   }
 }
 
-// 上传失败
-const handleError = (error) => {
-  uploading.value = false
-  uploadProgress.value = 0
-  console.error('上传失败:', error)
-  ElMessage.error('文件上传失败，请重试')
-}
-
 // 关闭弹窗
 const handleClose = () => {
   visible.value = false