chore(backlog): 记录 g22 完成

.ua/backlog.json

@@ -538,7 +538,7 @@
       "title": "menu 键入字母快跳菜单项",
       "motivation": "菜单项多时方向键逐个移动太慢，与 select 的键入快跳对齐保持组件族一致性",
       "acceptance": "menu 展开时键入可打印字符循环聚焦 label 前缀匹配项（忽略大小写），1s 无输入重置；既有导航不变；npm run check 全绿",
-      "status": "open",
+      "status": "done",
       "notes": "自补：既有组件可用性细节"
     }
   ]

.ua/iterations.log

@@ -66,3 +66,4 @@
 {"ts":"2026-10-26T11:06:38+08:00","id":"g19","result":"done","commit":"34abe3f","summary":"textarea maxCount 设原生 maxlength 并在下方附加块显示实时 n/limit 计数"}
 {"ts":"2026-10-26T11:08:38+08:00","id":"g20","result":"done","commit":"646fed9","summary":"inputNumber 长按 −/+ 400ms 后每 100ms 连发步进，松开或移出即停，单击不变"}
 {"ts":"2026-10-26T11:11:28+08:00","id":"g21","result":"done","commit":"c5a4a37","summary":"pagination jumpable 时末尾显示页码输入与总页数，回车跳转自动钳制范围"}
+{"ts":"2026-10-26T11:13:47+08:00","id":"g22","result":"done","commit":"9bef9d2","summary":"menu 展开后键入字母按前缀环形快跳菜单项，与 select 行为对齐"}