docs(changelog): sync full changelog from tego-standard

[baizixv]

Automatically sync full changelog files from tego-standard repository to ensure consistency. This PR overwrites the changelog files in docs repository with the complete changelog from tego-standard repository.

Summary by CodeRabbit

• Documentation
  • Updated changelog to document version 1.6.20 release (2026-05-21) with new features and bug fixes in both English and Chinese versions.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bbdd66e4-3748-4bae-8171-af386e466dbb

📥 Commits

Reviewing files that changed from the base of the PR and between 860d799 and da1b10e.

📒 Files selected for processing (2)

• docs/en/changelog/changelog.md
• docs/zh/changelog/changelog.md

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📝 Walkthrough

Walkthrough

This PR updates the English and Chinese changelog documentation files to record the v1.6.20 release dated 2026-05-21, adds entries for new features and bug fixes with corresponding PR references, and advances the Unreleased baseline comparison link to the new release tag.

Changes

v1.6.20 Changelog Release Update

Layer / File(s)	Summary
Release entry and reference links across language versions docs/en/changelog/changelog.md, docs/zh/changelog/changelog.md	English and Chinese changelog files are updated with a new 1.6.20 release section containing dated entry, Added and Fixed subsections with PR links, and bottom reference definitions adjusted so [Unreleased] compares from v1.6.20...HEAD with a new [1.6.20] release tag link added in both versions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• tegojs/docs#229: Similar changelog update adding a release section and adjusting Unreleased compare base and release tag links.
• tegojs/docs#226: Parallel changelog PR updating both English and Chinese files with a new dated release section and reference link updates.
• tegojs/docs#225: Part of the same changelog-sync theme, updating changelog entries under Unreleased and adjusting version reference links.

Poem

🐰 A release marked in stone, both East and West,
v1.6.20 now shows its very best—
Two tongues speak truth of bugs now mended, features new,
Links updated true, from the hopeful to the known and true.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/sync-full-changelog-20260521-102747

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