fix(route/xueqiu): serialize show.json requests and skip caching transient failures

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: sirius60111

lib/routes/xueqiu/user.ts

@@ -115,9 +115,12 @@ async function handler(ctx) {
 
     const data = response.statuses.filter((s) => s.mark !== 1); // 去除置顶动态
 
-    const items = await Promise.all(
-        data.map((item) =>
-            cache.tryGet(item.target, async () => {
+    // Serial execution avoids concurrency-triggered rate limiting on show.json.
+    const items = [];
+    /* eslint-disable no-await-in-loop */
+    for (const item of data) {
+        try {
+            items.push(await cache.tryGet(item.target, async () => {
                 // legal_user_visible 为 true 时列表已含完整内容，无需再请求详情
                 if (item.legal_user_visible) {
                     return buildListItem(item);
@@ -140,12 +143,22 @@ async function handler(ctx) {
                         pubDate: parseDate(item.created_at),
                         link: rootUrl + item.target,
                     };
-                } catch {
-                    return buildListItem(item);
+                } catch (error: any) {
+                    // Permanent failures (post deleted / not found): cache the fallback.
+                    const data = error.response?._data || error.data;
+                    if (data && typeof data === 'object' && data.error_code) {
+                        return buildListItem(item);
+                    }
+                    // Transient failures (rate limit / WAF): throw to skip caching, retry next request.
+                    throw error;
                 }
             })
-        )
-    );
+        );
+        } catch {
+            items.push(buildListItem(item));
+        }
+    }
+    /* eslint-enable no-await-in-loop */
 
     const user = data[0]?.user;