ci: publish version.json on GitHub Pages and rebuild on release

[Soner (shyim)]

Summary

• Publish version.json ({"version":"..."}) from the GitHub Pages config-schema site
• Redeploy Pages when a GitHub release is published (in addition to schema changes on main)
• Resolve version from the triggering stable release, otherwise from the latest non-prerelease tag

Test plan

• Merge and run the workflow via workflow_dispatch (or wait for next schema push)
• Confirm version.json is served on GitHub Pages with the expected latest version
• After the next release, confirm Pages redeploys and version.json updates

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.42%. Comparing base (e4ffef1) to head (752fc47).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1248      +/-   ##
==========================================
- Coverage   53.44%   53.42%   -0.03%     
==========================================
  Files         301      301              
  Lines       23222    23235      +13     
==========================================
+ Hits        12412    12413       +1     
- Misses      10810    10822      +12     

Flag	Coverage Δ
go-test	53.42% <ø> (-0.03%)	⬇️

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