fix(forms): 修复 Select 组件 showSearch 属性传递和样式问题

- 将 FormItemsRenderer 中 Select 组件的 showSearch 属性改为对象格式以支持 optionFilterProp
- 修改 Basic Select 组件中 showSearch 属性为对象格式以支持 optionFilterProp
- 修复 FormItemsRenderer 中表单项容器样式，添加 minWidth 以避免布局问题

src/components/FormBuilder/FormItemsRenderer.js

@@ -302,7 +302,7 @@ const FormItemsRenderer = ({
 
       case FORM_ITEM_RENDER_ENUM.SELECT:
         return (
-          <Select placeholder={placeholder} showSearch allowClear optionFilterProp="children" {...componentProps}>
+          <Select placeholder={placeholder} showSearch={{ optionFilterProp: "children" }} allowClear {...componentProps}>
             {(option.items || []).map((item) => {
               const { value, label, disabled } = getSelectableItemAttributes(item, itemsFieldKey);
               return (
@@ -619,7 +619,7 @@ const FormItemsRenderer = ({
                               {...formItemProps}
                             >
                               <div style={{ display: "flex", gap: 10, alignItems: "center", justifyContent: "space-between" }}>
-                                <div style={{ flex: 1 }}>
+                                <div style={{ flex: 1, minWidth: 0 }}>
                                   <Form.Item
                                     noStyle
                                     rules={getRules(listOption)}

src/components/Select/Basic/index.js

@@ -59,7 +59,7 @@ function BasicSelect(props) {
   }, [data]);
 
   return (
-    <Select placeholder={`请选择${placeholder}`} showSearch allowClear optionFilterProp="children" onChange={handleChange} {...restProps}>
+    <Select placeholder={`请选择${placeholder}`} showSearch={{ optionFilterProp: "children" }} allowClear onChange={handleChange} {...restProps}>
       {data.map((item) => {
         const value = item[idKey];
         const label = labelRender ? labelRender(item) : item[nameKey];