fix(admin): 修正设置主IP确认文案，移除CloudInit重建描述

VmDetail 与 UserVmDetail 设置主IP提示与实际行为一致，仅提示将重启虚拟机。

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

src/views/user-vm/UserVmDetail.vue

@@ -1791,7 +1791,7 @@ const handleDeleteVmNetwork = (row) => {
 
 const handleSetVmNetworkPrimary = (row) => {
   ElMessageBox.confirm(
-    `将「${row.address || row.name}」设为主IP？设置后将触发 CloudInit 重建并重启虚拟机。`,
+    `将「${row.address || row.name}」设为主IP？设置后将重启虚拟机。`,
     '设置主IP', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }
   ).then(async () => {
     try {

src/views/virtualization/VmDetail.vue

@@ -2939,7 +2939,7 @@ const handleNetDelete = (row) => {
 
 const handleSetPrimary = (row) => {
   ElMessageBox.confirm(
-    `将「${row.address || row.name}」设为主IP？设置后将触发 CloudInit 重建并重启虚拟机。`,
+    `将「${row.address || row.name}」设为主IP？设置后将重启虚拟机。`,
     '设置主IP', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }
   ).then(async () => {
     try {