Handle containerd connection failures in procscan

Problem statement: procscan 无法连接上 containerd 导致无法取得进程信息。

The issue names procscan and containerd but provides no file, test, or expected failure behavior. Start by locating procscan's containerd connection entry point and tracing how connection failures affect process information retrieval. Confirm the intended behavior before making a change; done should mean the specified failure case is handled without losing the expected process information.

Written by the indexing model from the issue text.