fix: 菜单分组渲染逻辑 — 相同group合并为一个分组标题

frontend/src/layouts/MainLayout.vue

@@ -91,23 +91,26 @@ const filteredMenus = computed(() => {
 // 按分组组织菜单
 const menuGroups = computed(() => {
   const groups: { label: string; items: typeof MENU_ITEMS }[] = []
-  let currentLabel = ''
-  let currentItems: typeof MENU_ITEMS = []
+  const groupMap = new Map<string, typeof MENU_ITEMS>()
 
   for (const item of filteredMenus.value) {
-    if (item.group) {
-      if (currentItems.length > 0) {
-        groups.push({ label: currentLabel, items: currentItems })
-      }
-      currentLabel = item.group as string
-      currentItems = [item]
-    } else {
-      currentItems.push(item)
+    const label = item.group || ''
+    if (!label) continue
+    if (!groupMap.has(label)) {
+      groupMap.set(label, [])
     }
+    groupMap.get(label)!.push(item)
   }
-  if (currentItems.length > 0) {
-    groups.push({ label: currentLabel, items: currentItems })
+
+  // 按出现顺序输出
+  const seen = new Set<string>()
+  for (const item of filteredMenus.value) {
+    const label = item.group || ''
+    if (!label || seen.has(label)) continue
+    seen.add(label)
+    groups.push({ label, items: groupMap.get(label)! })
   }
+
   return groups
 })