fix: 虚拟机网络管理改为解绑逻辑，不再删除底层网络

将 user-vm/UserVmDetail 和 virtualization/VmDetail 中的网络删除操作改为通过 updateVm 接口解绑，与绑定网络逻辑对称，避免误删底层物理网络。

Co-authored-by: Cursor <cursoragent@cursor.com>

src/views/user-vm/UserVmDetail.vue

@@ -344,7 +344,7 @@
                 <template #default="{ row }">
                   <el-button v-if="!row.is_primary" link type="warning" size="small" @click="handleSetVmNetworkPrimary(row)">设为主IP</el-button>
                   <el-button link type="danger" size="small" :loading="deletingNetworkId === row.id" @click="handleDeleteVmNetwork(row)">
-                    <el-icon :size="14"><Delete /></el-icon>删除
+                    <el-icon :size="14"><Delete /></el-icon>解绑
                   </el-button>
                 </template>
               </el-table-column>
@@ -1807,21 +1807,27 @@ const resolveNetworkServiceHost = async (row) => {
 }
 const handleDeleteVmNetwork = (row) => {
   ElMessageBox.confirm(
-    `将删除底层网络「${row.name}」(ID:${row.id})，该操作会影响所有绑定该网络的虚拟机，是否继续？`,
-    '删除网络',
-    { confirmButtonText: '确定删除', cancelButtonText: '取消', type: 'warning' }
+    `确定从该虚拟机解绑网络「${row.name}」(ID:${row.id}) 吗？`,
+    '解绑网络',
+    { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }
   ).then(async () => {
     deletingNetworkId.value = row.id
     try {
-      const { serviceId, hostId } = await resolveNetworkServiceHost(row)
-      if (!serviceId) { ElMessage.error('无法获取该网络所属服务ID，删除失败'); return }
-      const params = { service_id: serviceId, network_id: row.id }
-      if (hostId) params.host_id = hostId
-      const res = await deletePointNetwork(params)
-      if (res?.data?.code === 200) { ElMessage.success('删除成功'); loadDetail() }
-      else ElMessage.error(extractApiError(res?.data, '删除失败'))
+      const payload = { user_goods_id: userGoodsId.value }
+      const remainingNetworks = vmNetworks.value.filter(n => n.id !== row.id)
+      const bridgeIds = remainingNetworks.filter(n => n.type === 'bridge').map(n => n.id)
+      const natNet = remainingNetworks.find(n => n.type === 'nat')
+      payload.network_ids = bridgeIds
+      if (natNet) payload.internet_network_id = natNet.id
+      if (vm.value?.rx_bandwidth) payload.rx_bandwidth = vm.value.rx_bandwidth
+      if (vm.value?.tx_bandwidth) payload.tx_bandwidth = vm.value.tx_bandwidth
+      if (vm.value?.ssh_port) payload.ssh_port = vm.value.ssh_port
+      if (inPortGroup.value?.id) payload.port_group_id = inPortGroup.value.id
+      const res = await updateUserVm(payload)
+      if (res?.data?.code === 200) { ElMessage.success('解绑网络成功'); loadDetail() }
+      else ElMessage.error(extractApiError(res?.data, '解绑网络失败'))
     } catch (e) {
-      ElMessage.error(extractApiError(e?.response?.data, '删除失败'))
+      ElMessage.error(extractApiError(e?.response?.data, '解绑网络失败'))
     } finally {
       deletingNetworkId.value = 0
     }