chore(backlog): 记录 g21 完成

.ua/backlog.json

@@ -530,7 +530,7 @@
       "title": "pagination 跳页输入框",
       "motivation": "页数多时逐页点击太慢，主流分页器都提供直接跳页入口",
       "acceptance": "jumpable 开启且总页数 > 1 时末尾显示页码输入 + 总页数，回车跳转并钳制合法范围；npm run check 全绿",
-      "status": "open",
+      "status": "done",
       "notes": "自补：既有组件可用性细节"
     }
   ]

.ua/iterations.log

@@ -65,3 +65,4 @@
 {"ts":"2026-10-26T11:04:02+08:00","id":"g18","result":"done","commit":"44b8697","summary":"textField clearable 开启后有值即显一键清空按钮，点击同步信号与 onInput，空值自动隐藏"}
 {"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"}