Enable zh-cn path link checks

[Shaohan-He]

Related issue number or link

Part of #3190

Description

Fixes remaining invalid zh-cn internal paths, then updates .htmltest.yml\ so zh-cn is no longer excluded from path link checking. zh-tw remains ignored because it is tracked separately in #3190.

Validation

• \git diff --check\
• Custom zh-cn internal path check script: passed
• 
  pm install --no-package-lock\ timed out locally before dependencies were installed, so the full
  pm run check:links\ validation is left to CI.

Checklist before opening this PR

• I have signed off my commits.
• I have checked the changed zh-cn internal links.

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[seokho-son]

Thanks @Shaohan-He :)

Your PR contents lgtm. (actually, update for localization content needs to be handled by dev-xx branch not main branch directly, but I guess the zh-ch team may handle this PR in the main branch since this update is a bug fix)

The link checker identified additional broken links. Could you fix the following links?

========================================================================
zh-cn/scalability/index.html
  target does not exist --- zh-cn/scalability/index.html --> /zh/cluster/
zh-cn/container-orchestration/index.html
  target is a directory, href lacks trailing slash --- zh-cn/container-orchestration/index.html --> /zh-cn/kubernetes
  target is a directory, href lacks trailing slash --- zh-cn/container-orchestration/index.html --> /zh-cn/microservices
  target is a directory, href lacks trailing slash --- zh-cn/container-orchestration/index.html --> /zh-cn/distributed-systems
========================================================================

[Shaohan-He]

Thanks @seokho-son !

I fixed the remaining zh-cn link checker failures in commit 1d30a59:

• Updated /zh/cluster/ to /zh-cn/cluster/
• Added trailing slashes for /zh-cn/kubernetes/, /zh-cn/microservices/, and /zh-cn/distributed-systems/

git diff --check passed locally.

I also tried running the link check locally, but it failed because Hugo is not installed in my local environment, so I’ll rely on CI for the final validation.

It looks like the workflows are currently awaiting maintainer approval. Could you please approve and rerun them when convenient?