Fix cached docs artifact upload paths

[yuecideng]

Description

This PR completes the docs artifact upload fix after the merged PR still failed on _static/clipboard.min.js?v=a7894cd8.

The remaining failure came from two paths missed by the first fix:

• restored docs cache entries could already contain invalid query-string filenames, and skipped cached versions were never normalized
• recursive wget can preserve the GitHub Pages repository path and create build/html/EmbodiChain/v0.2.2/..., so normalization ran against build/html/v0.2.2 while the bad file lived elsewhere

This PR normalizes the whole restored build tree, promotes repo-prefixed wget output into the expected version directory, and removes empty leftover directories.

Dependencies: none

Fixes the repeated docs artifact upload failure from run 28218363303.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which improves an existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (existing functionality will not work without user modification)
• Documentation update

Screenshots

N/A

Checklist

• I have run the black . command to format the code base.
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Dependencies have been updated, if applicable.

Verification

• black docs/scripts/merge_published_site.py tests/docs/conftest.py tests/docs/test_merge_published_site.py
• black --check docs/scripts/merge_published_site.py tests/docs/conftest.py tests/docs/test_merge_published_site.py
• pytest tests/docs -q --confcutdir=tests/docs

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