feat(AddressSelector): 添加nut-config-provider包装级联选择器以支持主题变量

为AddressSelector组件中的nut-cascader添加nut-config-provider包装，支持通过themeVars配置主题样式，如激活项颜色

@@ -56,14 +56,16 @@
     </nut-popup>
 
     <!-- 省市县级联选择器 - 放在popup外面避免层级冲突 -->
-    <nut-cascader
-      v-model="selectedAreaCodes"
-      v-model:visible="showAreaPicker"
-      :options="areaData"
-      @change="onAreaChange"
-      @path-change="onAreaPathChange"
-      title="请选择省市县"
-    />
+    <nut-config-provider :theme-vars="themeVars">
+      <nut-cascader
+        v-model="selectedAreaCodes"
+        v-model:visible="showAreaPicker"
+        :options="areaData"
+        @change="onAreaChange"
+        @path-change="onAreaPathChange"
+        title="请选择省市县"
+      />
+    </nut-config-provider>
   </view>
 </template>
 
@@ -72,6 +74,12 @@ import { ref, computed, watch } from 'vue'
 import { RectRight, ArrowRight } from '@nutui/icons-vue-taro'
 import { areaList } from '@vant/area-data'
 
+const themeVars = {
+    // cascaderBarColor: 'orange',
+    // cascaderItemColor: 'orange',
+    cascaderItemActiveColor: 'orange',
+}
+
 /**
  * 转换@vant/area-data的扁平化数据为NutUI Cascader组件需要的树形结构
  * @param {Object} areaList - @vant/area-data的原始数据
@@ -79,16 +87,16 @@ import { areaList } from '@vant/area-data'
  */
 const transformAreaData = (areaList) => {
   const { province_list, city_list, county_list } = areaList
-  
+
   return Object.keys(province_list).map(provinceCode => {
     const provinceName = province_list[provinceCode]
-    
+
     // 获取该省份下的所有城市
     const cities = Object.keys(city_list)
       .filter(cityCode => cityCode.startsWith(provinceCode.substring(0, 2)))
       .map(cityCode => {
         const cityName = city_list[cityCode]
-        
+
         // 获取该城市下的所有区县
         const counties = Object.keys(county_list)
           .filter(countyCode => countyCode.startsWith(cityCode.substring(0, 4)))
@@ -96,14 +104,14 @@ const transformAreaData = (areaList) => {
             value: countyCode,
             text: county_list[countyCode]
           }))
-        
+
         return {
           value: cityCode,
           text: cityName,
           children: counties.length > 0 ? counties : undefined
         }
       })
-    
+
     return {
       value: provinceCode,
       text: provinceName,
@@ -284,11 +292,11 @@ const getAreaTextFromCodes = () => {
   if (codes.length >= 1 && province_list[codes[0]]) {
     result.province = province_list[codes[0]]
   }
-  
+
   if (codes.length >= 2 && city_list[codes[1]]) {
     result.city = city_list[codes[1]]
   }
-  
+
   if (codes.length >= 3 && county_list[codes[2]]) {
     result.county = county_list[codes[2]]
   }