refactor(ns-contact): 替换硬编码文本为多语言配置

将页面中硬编码的客服相关文本替换为国际化语言包调用，实现多语言支持

components/ns-contact/ns-contact.vue

@@ -29,10 +29,10 @@
         <uni-popup ref="servicePopup" type="center">
             <view class="service-popup-wrap">
                 <view class="head-wrap" @click="$refs.servicePopup.close()">
-                    <text>联系客服</text>
+                    <text>{{ $lang('chat.customerService') }}</text>
                     <text class="iconfont icon-close"></text>
                 </view>
-                <view class="body-wrap">{{ siteInfo.site_tel ? '请联系客服，客服电话是' + siteInfo.site_tel : '抱歉，商家暂无客服，请线下联系' }}
+                <view class="body-wrap">{{ siteInfo.site_tel ? $lang('chat.contactService') + siteInfo.site_tel : $lang('chat.noService') }}
                 </view>
             </view>
         </uni-popup>