Crontab spams metrics to server even once run is completed in Offline mode

When using Offline mode, with a cronjob using simvue_sender to upload metrics every minute, it appears that metrics are spammed to the server whenever there is something in the Simvue cache, even when the simulation / run is closed.

It also looks like it repeatedly sends the same metrics/events to the run. For example, in this run (https://dev01.simvue.io/dashboard/runs/run/G9rcfVMCiZcjPSZXQwHL6P), the last minute in which it sent events before it crashed, it sent 340 events at once (should send a maximum of ~5 at any time for this simulation). It also sends the same event over and over again (eg each 'Starting Epoch X' message should only ever appear once, yet every minute it is sent multiple times.

从 Offline 模式的 simvue_sender cronjob 路径开始，跟踪一次运行结束后如何选择缓存的指标和事件。使用每分钟上传一次来复现报告中的行为，然后验证已完成的运行不再接收数据，并且每个指标或事件只发送一次。