修复0超话签到推送消息显示为成功的问题

backend/task_scheduler/app/main.py

@@ -279,6 +279,14 @@ def _push_signin_result(account_id: str, result: dict, elapsed: float):
             lines = [f"⏰ {remark} 签到超时 ({elapsed:.1f}s)"]
         elif status == "error":
             lines = [f"❌ {remark} 签到异常: {result.get('reason', '未知')}"]
+        elif status == "completed" and result.get("signed", 0) == 0 and result.get("total", 0) == 0:
+            msg = result.get("message", "")
+            if "no topics" in msg:
+                lines = [f"⚠️ {remark} 签到失败: 获取超话列表失败（可能被风控或 Cookie 失效）"]
+            elif "no selected" in msg:
+                lines = [f"⚠️ {remark} 签到跳过: 没有选中的超话"]
+            else:
+                lines = [f"⚠️ {remark} 签到异常: 0 个超话 ({msg})"]
         else:
             signed = result.get("signed", 0)
             already = result.get("already_signed", 0)