feat: 更新充值相关文案为购买洗车金额并优化客服功能

将应用中所有"充值"相关文案统一修改为"购买洗车金额"，提升用户理解
重构客服电话功能为微信客服聊天窗口，优化用户体验
移除不必要的电话拨打代码，使用微信原生客服功能

pages/user/user.wxml

@@ -18,7 +18,7 @@
             <view class="my-capital shadow">
                 <view class="title">
                     <view class="text">我的资产</view>
-                    <view bindtap="toPage" class="btn" data-refresh="1" data-url="voucher/voucher">立即充值 ></view>
+                    <view bindtap="toPage" class="btn" data-refresh="1" data-url="voucher/voucher">立即购买 ></view>
                 </view>
                 <view class="money-box">
                     <view class="item">
@@ -62,14 +62,14 @@
             <text class="iconfont icon-{{item.img}}"></text>
             <view class="name">{{item.name}}</view>
         </view>
-        <view bindtap="callUs" class="item" openType="contact">
+        <!-- <view bindtap="callUs" class="item" openType="contact">
             <text class="iconfont icon-10"></text>
             <view class="name">联系客服</view>
-        </view>
+        </view> -->
     </view>
     <view class="footer-btn">
         <navigator class="btn" hoverClass="hover" url="/pages/index/index">首页</navigator>
         <view class="btn">扫一扫</view>
-        <navigator class="btn" hoverClass="hover" url="/pages/voucher/voucher">充值</navigator>
+        <navigator class="btn" hoverClass="hover" url="/pages/voucher/voucher">购买洗车金额</navigator>
     </view>
 </view>