[BUG] <title>hertzbeat1.8新增了webhook通知对象和通知策略为转发所有，测试能正常收到hook请求，但是hook没有收到其他所有的监控消息

### Is there an existing issue for this? - [x] I have searched the existing issues ### Current Behavior [BUG] <title>hertzbeat1.8新增了webhook通知对象和通知策略为转发所有，测试能正常收到hook请求，但是hook没有收到其他所有的监控消息， 以下是我的测试日志： 2026-04-16 10:14:13=中文测试 on port 28080, path /webhook 2026-04-16 10:21:18===== Received Webhook ===== { "title": "🔔 HertzBeat Alert Notification", "status": "firing", "commonLabels": { "alertName": "CPU Usage Alert" }, "alerts": [ { "index": 1, "labels": { "instance": "127.0.0.1", "alertname": "CPU Usage Alert" }, "content": "test send msg! \\n This is the test data. It is proved that it can be received successfully", "triggerTimes": 2, "startAt": "2026-04-16 10:21:34", "activeAt": "2026-04-16 10:21:34", "endAt": "2026-04-16 10:21:34", "annotations": { "suggest": "Please check the CPU usage of the server" } }, { "index": 2, "labels": { "instance": "127.0.0.1", "alertname": "CPU Usage Alert" }, "content": "test send msg! \\n This is the test data. It is proved that it can be received successfully", "triggerTimes": 4, "startAt": "2026-04-16 10:21:34", "activeAt": "2026-04-16 10:21:34", "endAt": "2026-04-16 10:21:34", "annotations": { "suggest": "Please check the CPU usage of the server" } } ], "commonAnnotations": { "suggest": "Please check the CPU usage of the server" } } ============================ ### Expected Behavior _No response_ ### Steps To Reproduce 版本：apache-hertzbeat-collector-1.8.0-bin.tar.gz jdk-17.0.12_linux-x64_bin.tar.gz ### Environment ```markdown HertzBeat version(s): ``` ### Debug logs _No response_ ### Anything else? _No response_