refactor: 移动端升级 Vue3 + uView Plus

将 lilishop-uniapp 从 Vue2/uView 1.6 迁移到 Vue3/uview-plus，优先支持 H5/微商城与微信小程序；移除 vendored uview-ui，改用 npm 依赖、Vuex4 与迁移脚本/补丁，并补充 VUE3_MIGRATION.md 回归清单。

Co-authored-by: Cursor <cursoragent@cursor.com>

pages/tabbar/home/template/advertising.scss

@@ -7,7 +7,7 @@
     display: flex;
   }
   .item-price {
-    > span {
+    .price-text {
       font-size: 15px;
       font-weight: 500;
       color: #e1212b;
@@ -26,7 +26,7 @@
     position: relative;
   }
   .item-line-through {
-    > span {
+    .price-text {
       font-size: 10px;
       font-weight: 400;
       text-decoration: line-through;
@@ -46,12 +46,12 @@
     align-items: center;
     background: #fff;
     height: 50px;
-    > div:nth-of-type(1) {
+    .join-title-name {
       font-size: 16px;
       font-weight: bold;
     }
-    > div:nth-of-type(2) {
+    .join-title-more {
       font-size: 12px;
       color: #999;
     }
-  }
+  }