feat: 任务详情 LLM 进度与失败原因标识（列表失败原因摘要）

cloud/console-react/src/sections/TaskListSection.tsx

@@ -72,6 +72,9 @@ export default function TaskListSection({ onNew }: { onNew: () => void }) {
                     {" · "}<span title={durTitle}>耗时 {dur}</span>
                     {" · "}<span title={tokTitle}>{tok}</span>
                   </div>
+                  {(t.status === "failed" || t.status === "interrupted" || t.status === "merge-failed") && t.error_text ? (
+                    <div className="issue-meta" title={t.error_text}>{/503|Service Unavailable/.test(t.error_text) ? "上游 503：模型服务暂时不可用" : t.error_text.replace(/\s+/g, " ").slice(0, 60)}</div>
+                  ) : null}
                 </span>
               </li>
               );