docs: migrate documentation repo into monorepo

[laugiov]

Context

This PR migrates the OpenAEV-Platform/docs repository into the openaev monorepo as the docs/ subfolder.

Note on check-signed-commits: the historical commits brought in by the migration are not signed. Decision from the team is to bypass the check for this PR (admin merge). My two commits on top are signed.

What's in this PR

• git filter-repo --to-subdirectory-filter docs --replace-text on the docs source, then --allow-unrelated-histories merge into the feature branch. Preserves commits, authors, file-level git log --follow.
• Post-merge reference updates:
• mkdocs.yml: edit_uri and git-committers repository now point to OpenAEV-Platform/openaev on main
• comments.html: Giscus data-repo, data-repo-id, data-category-id updated to openaev / General
• 10 admonitions + README.md: OpenAEV-Platform/docs → OpenAEV-Platform/openaev
• xtm-suite-connector.md: fix a pre-existing broken relative link
• .gitignore: ignore the local mkdocs build venv
• mkdocs build --strict passes locally.

What's NOT in this PR (Day-D follow-ups)

• gh-pages branch migration (separate operation to preserve the historical doc versions)
• GitHub Pages reconfiguration with docs.openaev.io as custom domain
• Archive / repo-redirect decision on OpenAEV-Platform/docs

Before merge

• Admin to bypass check-signed-commits at merge time
• All open PRs on OpenAEV-Platform/docs triaged (merge before, or recreate against openaev/docs/ after)
• Coordination on Pages cutover (expected short downtime on docs.openaev.io)
• Community + dev team notification

[github-actions]

Thank you for your contribution. This PR is but one step away from being ready for merging: all commits must be PGP-signed. To get started, please see https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.88%. Comparing base (7a5d27e) to head (deae582).
⚠️ Report is 16 commits behind head on main.

❌ Your project check has failed because the head coverage (2.20%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6236      +/-   ##
============================================
+ Coverage     42.84%   42.88%   +0.04%     
- Complexity     6798     6802       +4     
============================================
  Files          2238     2238              
  Lines         61215    61215              
  Branches       8014     8014              
============================================
+ Hits          26228    26254      +26     
+ Misses        33305    33280      -25     
+ Partials       1682     1681       -1     

Flag	Coverage Δ
backend	64.98% <ø> (+0.01%)	⬆️
e2e	17.77% <ø> (+0.68%)	⬆️
frontend	2.20% <ø> (ø)

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