优化支付宝支付流程与 Web 端体验

- 支付宝新窗口跳转，轮询与手动刷新增加加载反馈
- 支付回跳先校验订单状态，避免未付款误报成功
- 门户登录回调统一，云文件打开加载与版本冲突同步
- 精简本地 start.bat 与 README 说明

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

frontend-web/js/index.js

@@ -351,14 +351,22 @@ layui.use(['layer', 'form', 'jquery'], function () {
 
       var start = (fileListState.page - 1) * fileListState.size;
       var slice = mapped.slice(start, start + fileListState.size);
+      var thumbRows = await Promise.all(slice.map(async function (item) {
+        var realType = item.type || 1;
+        return {
+          item: item,
+          src: await resolveRecentThumb(item),
+          fallbackSrc: recentFallbackThumb(realType)
+        };
+      }));
       let h = "";
 
-      for (let item of slice) {
-
+      for (let row of thumbRows) {
+        let item = row.item;
         let filePath = item.filePath;
         let realType = item.type || 1;
-        let src = await resolveRecentThumb(item);
-        let fallbackSrc = recentFallbackThumb(realType);
+        let src = row.src;
+        let fallbackSrc = row.fallbackSrc;
         let displayName = item.name || displayNameFromPath(filePath);
         let cardTitle = displayName;
         var cardClass = 'card';