feat: implement order export to Excel with excelize library

frontend/src/api/index.ts

@@ -150,7 +150,7 @@ export const adminApi = {
 
   getOrders: (params?: any) => api.get('/admin/orders', { params }),
   getOrderById: (id: number) => api.get(`/admin/orders/${id}`),
-  exportOrders: () => api.get('/admin/orders/export'),
+  exportOrders: () => api.get('/admin/orders/export', { responseType: 'blob' }),
   processRefund: (id: number, data: any) => api.put(`/admin/orders/${id}/refund`, data),
   updateOrderStatus: (id: number, data: any) => api.put(`/admin/orders/${id}/status`, data),
 

frontend/src/views/admin/Orders.vue

@@ -254,8 +254,21 @@ async function processRefund(id: number, status: string) {
 }
 
 async function exportOrders() {
-  await adminApi.exportOrders()
-  ElMessage.success('导出完成')
+  try {
+    const res = await adminApi.exportOrders()
+    const blob = new Blob([res.data], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' })
+    const url = window.URL.createObjectURL(blob)
+    const link = document.createElement('a')
+    link.href = url
+    link.download = `orders_${new Date().toISOString().slice(0, 10)}.xlsx`
+    document.body.appendChild(link)
+    link.click()
+    document.body.removeChild(link)
+    window.URL.revokeObjectURL(url)
+    ElMessage.success('导出完成')
+  } catch {
+    ElMessage.error('导出失败')
+  }
 }
 
 onMounted(fetchOrders)