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/common/portal-auth.js

@@ -77,28 +77,42 @@
       ? window.soonAuthedFetch(base + '/auth/me', { headers: { Authorization: 'Bearer ' + tok } })
       : fetch(base + '/auth/me', { headers: { Authorization: 'Bearer ' + tok } });
     meFetch
-      .then(function (r) { return r.json(); })
+      .then(function (r) {
+        if (r.status === 401) {
+          clearSession();
+          location.reload();
+          return null;
+        }
+        if (!r.ok) {
+          if (typeof window.soonToast === 'function') window.soonToast('网络异常，部分功能可能不可用', 'warn');
+          return null;
+        }
+        return r.json();
+      })
       .then(function (j) {
+        if (!j) return;
         if (!j.ok || !j.data) {
           clearSession();
           location.reload();
           return;
         }
+        if (typeof window.soonApplyMembership === 'function') {
+          window.soonApplyMembership(j.data);
+        }
         if (j.data.role === 'admin' && admin) admin.style.display = 'inline-flex';
         if (avatar && j.data.email) {
           avatar.style.display = 'inline-flex';
           avatar.textContent = j.data.email.charAt(0).toUpperCase();
           avatar.title = j.data.email;
         }
-        if (typeof window.soonLoadMembership === 'function') {
-          window.soonLoadMembership().then(function () {
-            if (typeof window.soonRefreshPortalIdentity === 'function') {
-              window.soonRefreshPortalIdentity();
-            }
-          });
+        if (typeof window.soonRefreshPortalIdentity === 'function') {
+          window.soonRefreshPortalIdentity();
         }
+        if (typeof options.onAuthed === 'function') options.onAuthed(j.data);
       })
-      .catch(function () { /* keep authed shell */ });
+      .catch(function () {
+        if (typeof window.soonToast === 'function') window.soonToast('网络异常，部分功能可能不可用', 'warn');
+      });
 
     if (logout) {
       logout.addEventListener('click', function (e) {