refactor(地址选择): 替换element-china-area-data为@vant/area-data并优化地区数据处理

重构地址选择组件和相关逻辑，使用@vant/area-data替代element-china-area-data
优化地区数据转换逻辑，直接从扁平化数据结构获取地区信息
移除不再需要的findNodeByCode函数，简化代码结构

@@ -55,8 +55,8 @@
     "@tarojs/runtime": "4.1.2",
     "@tarojs/shared": "4.1.2",
     "@tarojs/taro": "4.1.2",
+    "@vant/area-data": "^2.0.0",
     "axios-miniprogram": "^2.7.2",
-    "element-china-area-data": "^6.1.0",
     "pinia": "^3.0.3",
     "taro-plugin-pinia": "^1.0.0",
     "vue": "^3.3.0"

@@ -65,6 +65,9 @@ importers:
       '@tarojs/taro':
         specifier: 4.1.2
         version: 4.1.2(@tarojs/components@4.1.2(@tarojs/helper@4.1.2)(html-webpack-plugin@5.6.3(webpack@5.78.0(@swc/core@1.3.96)))(postcss@8.5.6)(react@19.1.1)(rollup@3.29.5)(vue@3.5.18(typescript@5.9.2))(webpack-chain@6.5.1)(webpack-dev-server@4.15.2(webpack@5.78.0(@swc/core@1.3.96)))(webpack@5.78.0(@swc/core@1.3.96)))(@tarojs/helper@4.1.2)(@tarojs/shared@4.1.2)(html-webpack-plugin@5.6.3(webpack@5.78.0(@swc/core@1.3.96)))(postcss@8.5.6)(rollup@3.29.5)(vue@3.5.18(typescript@5.9.2))(webpack-chain@6.5.1)(webpack-dev-server@4.15.2(webpack@5.78.0(@swc/core@1.3.96)))(webpack@5.78.0(@swc/core@1.3.96))
+      '@vant/area-data':
+        specifier: ^2.0.0
+        version: 2.0.0
       axios-miniprogram:
         specifier: ^2.7.2
         version: 2.7.2
@@ -2172,6 +2175,9 @@ packages:
   '@ungap/structured-clone@1.3.0':
     resolution: {integrity: sha512-WmoN8qaIAo7WTYWbAZuG8PYEhn5fkz7dZrqTBZ7dtt//lL2Gwms1IcnQ5yHqjDfX8Ft5j4YzDM23f87zBfDe9g==}
 
+  '@vant/area-data@2.0.0':
+    resolution: {integrity: sha512-zgP4AA8z09S9QTNgVCCHo9cHjcybrv22RJDYPjuCkecn4SB98T5EoPQh2TwqbQXmUhbaOGgiZGy3OUaUxnY7qg==}
+
   '@vue/babel-helper-vue-transform-on@1.5.0':
     resolution: {integrity: sha512-0dAYkerNhhHutHZ34JtTl2czVQHUNWv6xEbkdF5W+Yrv5pCWsqjeORdOgbtW2I9gWlt+wBmVn+ttqN9ZxR5tzA==}
 
@@ -9041,6 +9047,8 @@ snapshots:
 
   '@ungap/structured-clone@1.3.0': {}
 
+  '@vant/area-data@2.0.0': {}
+
   '@vue/babel-helper-vue-transform-on@1.5.0': {}
 
   '@vue/babel-plugin-jsx@1.5.0(@babel/core@7.28.0)':

@@ -70,19 +70,46 @@
 <script setup>
 import { ref, computed, watch } from 'vue'
 import { RectRight, ArrowRight } from '@nutui/icons-vue-taro'
-import { regionData } from 'element-china-area-data'
+import { areaList } from '@vant/area-data'
 
 /**
- * 转换地区数据格式以适配NutUI Cascader组件
- * @param {Array} data - element-china-area-data的原始数据
- * @returns {Array} - 转换后的数据格式
+ * 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
+ * @returns {Array} - 转换后的树形数据格式
  */
-const transformAreaData = (data) => {
-  return data.map(item => ({
-    value: item.value,
-    text: item.label,
-    children: item.children ? transformAreaData(item.children) : undefined
-  }))
+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)))
+          .map(countyCode => ({
+            value: countyCode,
+            text: county_list[countyCode]
+          }))
+        
+        return {
+          value: cityCode,
+          text: cityName,
+          children: counties.length > 0 ? counties : undefined
+        }
+      })
+    
+    return {
+      value: provinceCode,
+      text: provinceName,
+      children: cities.length > 0 ? cities : undefined
+    }
+  })
 }
 
 /**
@@ -127,7 +154,7 @@ const showAreaPicker = ref(false)
 const selectedAreaCodes = ref([])
 const selectedAreaText = ref('')
 const detailAddress = ref('')
-const areaData = ref(transformAreaData(regionData))
+const areaData = ref(transformAreaData(areaList))
 
 /**
  * 计算完整地址
@@ -154,13 +181,14 @@ const initAddressData = (addressData) => {
       addressData.city_code,
       addressData.county_code
     ]
-    // 根据code值查找对应的文本
-    const provinceNode = findNodeByCode(areaData.value, addressData.province_code)
-    const cityNode = provinceNode?.children ? findNodeByCode(provinceNode.children, addressData.city_code) : null
-    const countyNode = cityNode?.children ? findNodeByCode(cityNode.children, addressData.county_code) : null
-
-    if (provinceNode && cityNode && countyNode) {
-      selectedAreaText.value = `${provinceNode.text}${cityNode.text}${countyNode.text}`
+    // 根据code值直接从扁平化数据中获取对应的文本
+    const { province_list, city_list, county_list } = areaList
+    const provinceName = province_list[addressData.province_code] || ''
+    const cityName = city_list[addressData.city_code] || ''
+    const countyName = county_list[addressData.county_code] || ''
+
+    if (provinceName && cityName && countyName) {
+      selectedAreaText.value = `${provinceName}${cityName}${countyName}`
     }
   } else if (addressData.province && addressData.city && addressData.county) {
     // 兼容旧的文本格式
@@ -250,41 +278,25 @@ const confirmAddress = () => {
  */
 const getAreaTextFromCodes = () => {
   const codes = selectedAreaCodes.value
+  const { province_list, city_list, county_list } = areaList
   const result = { province: '', city: '', county: '' }
 
-  if (codes.length >= 1) {
-    const provinceNode = findNodeByCode(areaData.value, codes[0])
-    if (provinceNode) {
-      result.province = provinceNode.text
-
-      if (codes.length >= 2 && provinceNode.children) {
-        const cityNode = findNodeByCode(provinceNode.children, codes[1])
-        if (cityNode) {
-          result.city = cityNode.text
-
-          if (codes.length >= 3 && cityNode.children) {
-            const countyNode = findNodeByCode(cityNode.children, codes[2])
-            if (countyNode) {
-              result.county = countyNode.text
-            }
-          }
-        }
-      }
-    }
+  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]]
   }
 
   return result
 }
 
-/**
- * 根据编码查找节点
- * @param {Array} nodes - 节点数组
- * @param {String} code - 编码
- * @returns {Object|null} - 找到的节点或null
- */
-const findNodeByCode = (nodes, code) => {
-  return nodes.find(node => node.value === code) || null
-}
+// findNodeByCode 函数已移除，现在直接从 @vant/area-data 的扁平化数据中获取地区名称
 </script>
 
 <style lang="less">

@@ -271,7 +271,7 @@ import { useUserStore } from '@/stores/user'
 
 // 导入地址选择组件
 import AddressSelector from '@/components/AddressSelector.vue'
-import { regionData } from 'element-china-area-data'
+import { areaList } from '@vant/area-data'
 
 // 获取页面参数
 const instance = Taro.getCurrentInstance()
@@ -1150,30 +1150,49 @@ const addressData = ref({
 })
 
 /**
- * 转换地区数据格式以适配NutUI Cascader组件
- * @param {Array} data - element-china-area-data的原始数据
- * @returns {Array} - 转换后的数据格式
+ * 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
+ * @returns {Array} - 转换后的树形数据格式
  */
-const transformAreaData = (data) => {
-  return data.map(item => ({
-    value: item.value,
-    text: item.label,
-    children: item.children ? transformAreaData(item.children) : undefined
-  }))
+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)))
+          .map(countyCode => ({
+            value: countyCode,
+            text: county_list[countyCode]
+          }))
+        
+        return {
+          value: cityCode,
+          text: cityName,
+          children: counties.length > 0 ? counties : undefined
+        }
+      })
+    
+    return {
+      value: provinceCode,
+      text: provinceName,
+      children: cities.length > 0 ? cities : undefined
+    }
+  })
 }
 
 // 转换后的地区数据
-const areaData = ref(transformAreaData(regionData))
+const areaData = ref(transformAreaData(areaList))
 
-/**
- * 根据编码查找节点
- * @param {Array} nodes - 节点数组
- * @param {String} code - 编码
- * @returns {Object|null} - 找到的节点或null
- */
-const findNodeByCode = (nodes, code) => {
-  return nodes.find(node => node.value === code) || null
-}
+// findNodeByCode 函数已移除，现在直接从 @vant/area-data 的扁平化数据中获取地区名称
 
 /**
  * 根据省市县code值获取对应的文字
@@ -1183,27 +1202,19 @@ const findNodeByCode = (nodes, code) => {
  * @returns {Object} - 包含省市县文字的对象
  */
 const getAreaTextFromCodes = (provinceCode, cityCode, countyCode) => {
+  const { province_list, city_list, county_list } = areaList
   const result = { province: '', city: '', county: '' }
   
-  if (provinceCode) {
-    const provinceNode = findNodeByCode(areaData.value, provinceCode)
-    if (provinceNode) {
-      result.province = provinceNode.text
-      
-      if (cityCode && provinceNode.children) {
-        const cityNode = findNodeByCode(provinceNode.children, cityCode)
-        if (cityNode) {
-          result.city = cityNode.text
-          
-          if (countyCode && cityNode.children) {
-            const countyNode = findNodeByCode(cityNode.children, countyCode)
-            if (countyNode) {
-              result.county = countyNode.text
-            }
-          }
-        }
-      }
-    }
+  if (provinceCode && province_list[provinceCode]) {
+    result.province = province_list[provinceCode]
+  }
+  
+  if (cityCode && city_list[cityCode]) {
+    result.city = city_list[cityCode]
+  }
+  
+  if (countyCode && county_list[countyCode]) {
+    result.county = county_list[countyCode]
   }
   
   return result