refactor: default group no delete

Author: wxg0103

ui/src/views/system-chat-user/group/index.vue

@@ -46,7 +46,7 @@
                                 $t('common.rename')
                               }}
                             </el-dropdown-item>
-                            <el-dropdown-item @click.stop="deleteGroup(row)" class="border-t p-8">
+                            <el-dropdown-item @click.stop="deleteGroup(row)" class="border-t p-8" v-if="row.id !== 'default'">
                               <AppIcon iconName="app-copy"></AppIcon>
                               {{
                                 $t('common.delete')