ci: add link checker

[bearomorphism]

Let's try this.

Closes #1691

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.88%. Comparing base (120d514) to head (ace981a).
⚠️ Report is 887 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1696      +/-   ##
==========================================
+ Coverage   97.33%   97.88%   +0.55%     
==========================================
  Files          42       60      +18     
  Lines        2104     2605     +501     
==========================================
+ Hits         2048     2550     +502     
+ Misses         56       55       -1     

Flag	Coverage Δ
unittests	97.88% <ø> (+0.55%)	⬆️

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[bearomorphism]

@woile @Lee-W would you like to create issue form when broken link is found?

If we want to automatically create issues for broken links, we may need to adjust our repo settings

Failed run: https://github.com/commitizen-tools/commitizen/actions/runs/19989102721/job/57327236001
Potential solution: https://stackoverflow.com/questions/70435286/resource-not-accessible-by-integration-on-github-post-repos-owner-repo-ac

[bearomorphism]

@Lee-W @woile now this PR is ready. Could you take a look again? Thanks