feat: 设备分组移入工具页（原顶级 tab 删除）——工具页新增「设备分组」子分栏，分组管理入口与其他设备工具聚合

static/admin/base.js

@@ -99,7 +99,6 @@ function showTab(name){
   if(name==='monitor'){loadMonitor();_monitorTimer=setInterval(loadMonitor,5000);}
   if(name==='tasks'){showSubTab('tasks',_activeSubs.tasks);loadTasks();loadCustomActions();}
   if(name==='tools'){showSubTab('tools',_activeSubs.tools);loadToolsDevices();loadAdbDevices();loadTailscaleDevices();loadApks();}
-  if(name==='groups')loadGroups();
   if(name==='logs'){loadLogs();if(document.getElementById('log-auto').checked)_logTimer=setInterval(loadLogs,3000);}
   if(name==='users')loadUsers();
 }
@@ -114,6 +113,7 @@ function showSubTab(tabId, name){
   const tab = document.getElementById('tab-'+tabId);
   tab.querySelectorAll('.sub-tab').forEach(b=>b.classList.toggle('active', b.dataset.sub===name));
   tab.querySelectorAll('.sub-panel').forEach(p=>p.classList.toggle('active', p.id===tabId+'-sub-'+name));
+  if(name==='groups' && typeof loadGroups==='function') loadGroups();
   if(name==='devpool' && typeof loadDevPool==='function'){
     loadDevPool();
     if(typeof loadDiscovery==='function'){