feat: 购物车左侧添加返回首页按钮

- topMenu.js: 添加 home-btn 圆形按钮 (el-icon-s-home)
- topMenu.js: 添加 goIndex() 方法跳转 /index
- dark-override.css: home-btn 图标样式(18px/灰色/hover蓝)

clientarea/hgcloud/components/topMenu/topMenu.js

@@ -89,6 +89,11 @@ const topMenu = {
       </el-autocomplete>
     </div>
     <div class="header-right">
+      <div class="header-right-item">
+        <div class="right-item home-btn" @click="goIndex">
+          <i class="el-icon-s-home"></i>
+        </div>
+      </div>
       <div class="header-right-item car-item">
         <div v-if="isShowCart" class="right-item" @click="goShoppingCar">
           <el-badge :value="shoppingCarNum" class="item" :max="999" :hidden="shoppingCarNum === 0 ? true : false">
@@ -409,6 +414,9 @@ const topMenu = {
           this.isGetData = true;
         });
     },
+    goIndex () {
+      location.href = "/index";
+    },
     goShoppingCar () {
       localStorage.frontMenusActiveId = "";
       location.href = "/cart/shoppingCar.htm";