feat: 更新 PSelect 组件，添加 value 插槽支持，优化选项加载和输入交互体验

src/App.vue

@@ -4,7 +4,7 @@ import AllCustom from './all-custom/all-custom.vue';
 import TutorialForm from './tutorial-form/index.vue';
 import ZodForm from './zod-form/index.vue';
 
-const selectedCity = ref();
+const selectedCity = ref('NY');
 const loading = ref(false);
 const cities = ref([
   { name: 'New York', code: 'NY' },
@@ -53,6 +53,12 @@ const handleE = (eventName: string) => {
         @change="(e) => handleE('change')(e)"
         @blur="(e) => handleE('blur')(e)"
       ></Select>
+      <Select
+        :options="cities"
+        class="w-full md:w-56"
+      >
+        <template #value="slotProps">{{ slotProps.value }}</template>
+      </Select>
       <Button
         id="load-selected-city"
         label="Load Selected City"