[fix] Fix some issues related to ci

[Duansg]

What's changed?

• Issue 1: The test uses an unversioned image: private static final String VECTOR_IMAGE = "timberio/vector:latest-alpine";
  At the time, a new version was pulled into CI, and the Vector configuration schema had changed, causing the original protocol.headers field to no longer be accepted.

• Issue 2: There are currently too many directories being scanned by CI for docs, which leads to issues such as prolonged scan times and unreliable dead link detection. The scope of the scan needs to be narrowed; for example, only the source files in the current/dev directory should be checked.

Checklist

• I have read the Contributing Guide
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

Add or update API

• I have added the necessary e2e tests and all cases have passed.