fix: support sms signature file download

src/views/sms/SmsSignature.vue

@@ -288,8 +288,17 @@
         </div>
         <div class="detail-file-row">
           <span class="detail-img-label">申请文件</span>
-          <el-link v-if="detailData.application_file_url" type="primary" :href="detailData.application_file_url" target="_blank">查看申请文件</el-link>
-          <span v-else class="detail-empty-text">未上传</span>
+          <el-button
+            v-if="getApplicationFileUrl(detailData)"
+            link
+            type="primary"
+            :loading="applicationFileDownloading"
+            @click="downloadApplicationFile(detailData)"
+          >
+            <el-icon v-if="!applicationFileDownloading"><Download /></el-icon>
+            下载申请文件
+          </el-button>
+          <span v-else class="detail-empty-text">暂无可下载文件</span>
         </div>
       </div>
       <template #footer>
@@ -314,8 +323,9 @@
 
 <script setup>
 import { ref, reactive, onMounted } from 'vue'
+import axios from 'axios'
 import { ElMessage, ElMessageBox } from 'element-plus'
-import { Plus, User, Close, Picture } from '@element-plus/icons-vue'
+import { Plus, User, Close, Picture, Download } from '@element-plus/icons-vue'
 import { formatDate } from '@/utils/tool'
 import {
   getSmsServiceList,
@@ -392,6 +402,7 @@ const currentRow = ref(null)
 
 const detailVisible = ref(false)
 const detailData = ref(null)
+const applicationFileDownloading = ref(false)
 
 const userSelectorVisible = ref(false)
 const selectedUserInfo = ref(null)
@@ -466,6 +477,83 @@ const handleDetail = (row) => {
   detailVisible.value = true
 }
 
+const getSignatureService = (row) => {
+  const serviceId = row.service_id || queryParams.service_id
+  return serviceOptions.value.find(item => String(item.id) === String(serviceId))
+}
+
+const getApplicationFileUrl = (row) => {
+  if (!row?.ID || !row?.application_file_url) return ''
+  const service = getSignatureService(row)
+  const endpoint = String(service?.host || '').replace(/\/+$/, '')
+  if (!endpoint) return ''
+  return `${endpoint}/api/sms/admin/signature/${row.ID}/application-file`
+}
+
+const getDownloadFilename = (headers, signatureId) => {
+  const disposition = headers?.['content-disposition'] || ''
+  const utf8Match = disposition.match(/filename\*=UTF-8''([^;]+)/i)
+  const plainMatch = disposition.match(/filename="?([^";]+)"?/i)
+  const encodedName = utf8Match?.[1] || plainMatch?.[1]
+  if (!encodedName) return `签名申请文件_${signatureId}.xlsx`
+  try {
+    return decodeURIComponent(encodedName)
+  } catch {
+    return encodedName
+  }
+}
+
+const downloadApplicationFile = async (row) => {
+  const url = getApplicationFileUrl(row)
+  if (!url || applicationFileDownloading.value) return
+
+  const service = getSignatureService(row)
+  const endpoint = String(service?.host || '').replace(/\/+$/, '')
+  const serviceToken = service?.serviceToken || service?.service_token
+  if (!serviceToken) {
+    ElMessage.error('当前短信平台未配置 Service Token')
+    return
+  }
+
+  applicationFileDownloading.value = true
+  try {
+    const loginResponse = await axios.post(
+      `${endpoint}/api/auth/service-token-login`,
+      { service_token: serviceToken },
+      { timeout: 15000 }
+    )
+    const loginBody = loginResponse.data || {}
+    const platformToken = loginBody.data?.token
+    if (loginBody.code !== 200 || !platformToken) {
+      throw new Error(loginBody.message || '短信平台 Token 获取失败')
+    }
+
+    const response = await axios.get(url, {
+      headers: { Authorization: `Bearer ${platformToken}` },
+      responseType: 'blob',
+      timeout: 60000
+    })
+    const contentType = response.headers?.['content-type'] || ''
+    if (contentType.includes('application/json')) {
+      const body = JSON.parse(await response.data.text())
+      throw new Error(body.message || body.msg || '下载申请文件失败')
+    }
+
+    const objectUrl = window.URL.createObjectURL(response.data)
+    const link = document.createElement('a')
+    link.href = objectUrl
+    link.download = getDownloadFilename(response.headers, row.ID)
+    document.body.appendChild(link)
+    link.click()
+    link.remove()
+    window.URL.revokeObjectURL(objectUrl)
+  } catch (error) {
+    ElMessage.error(error.message || '下载申请文件失败')
+  } finally {
+    applicationFileDownloading.value = false
+  }
+}
+
 const handleAdd = () => {
   dialogType.value = 'add'
   selectedUserInfo.value = null