iter: e01 新增 inputNumber 数字输入组件（−/+ 步进 + 键盘上下调节，信号双向绑定，min/max/step 夹取）

packages/skin/ui/ua.manifest.json

@@ -15,6 +15,7 @@
     "exports": [
       "button(props)：按钮，variant = primary | ghost | danger，disabled 支持布尔或信号禁用",
       "textField(props)：文本输入，value 信号双向绑定，disabled 支持布尔或信号禁用",
+      "inputNumber(props)：数字输入，−/+ 按钮 + 键盘 ↑↓ 调节，value 信号双向绑定，min/max/step 超界自动夹取",
       "textarea(props)：多行输入，value 信号双向绑定，disabled 支持布尔或信号禁用",
       "slider(props)：滑块，value 信号双向绑定，min/max/step 可配，原生 range 承载键盘交互，右侧可显示当前值",
       "checkbox(props)：复选框，checked 信号双向绑定，disabled 支持布尔或信号禁用",
@@ -168,6 +169,52 @@
           "在任意响应式位置用 name() 读取最新值，如 () => `你好，${name()}`"
         ]
       },
+      {
+        "id": "inputNumber",
+        "title": "数字输入 InputNumber",
+        "demo": "sec-inputnumber",
+        "props": [
+          {
+            "n": "value",
+            "t": "Signal<number>",
+            "r": 1,
+            "d": "当前值信号，双向绑定（按钮/键盘写回、外部赋值同步）"
+          },
+          {
+            "n": "min",
+            "t": "number",
+            "d": "最小值；缺省无下限"
+          },
+          {
+            "n": "max",
+            "t": "number",
+            "d": "最大值；缺省无上限"
+          },
+          {
+            "n": "step",
+            "t": "number",
+            "d": "步长；缺省 1",
+            "df": "1"
+          },
+          {
+            "n": "disabled",
+            "t": "boolean | Signal<boolean>",
+            "d": "禁用态：布尔直接置位，传信号则动态同步"
+          },
+          {
+            "n": "onChange",
+            "t": "(value: number) => void",
+            "k": 1,
+            "d": "值变化回调（已夹取到合法区间）"
+          }
+        ],
+        "example": "const qty = signal(1); const el = inputNumber({ value: qty, min: 1, max: 99, onChange: (v) => console.log(v) })",
+        "steps": [
+          "用 signal(1) 创建数字信号并传入 value 完成双向绑定",
+          "点击 −/+ 按钮或在输入框聚焦时按 ↑↓ 以 step 调节；直接输入在失焦或回车时解析",
+          "非法输入自动回滚为当前值；min/max 超界自动夹取，disabled 支持布尔或信号禁用"
+        ]
+      },
       {
         "id": "textarea",
         "title": "多行输入 Textarea",