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

Release Notes

• Documentation
  • Updated changelog with v1.6.18 release notes documenting client and form-design bug fixes

[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: 59b8d1e9-13dc-45ac-83f2-ec7e5cbf01ea

📥 Commits

Reviewing files that changed from the base of the PR and between 5119a60 and 0a6566d.

📒 Files selected for processing (2)

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

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📝 Walkthrough

Walkthrough

The PR documents the v1.6.18 release (2026-05-19) by adding a new Fixed section listing multiple client and form-design corrections to both English and Chinese changelog files, and updates link references so "[Unreleased]" now compares from v1.6.18...HEAD with a new "[1.6.18]" release tag URL.

Changes

v1.6.18 Release Documentation

Layer / File(s)	Summary
Release v1.6.18 entry with fixes docs/en/changelog/changelog.md, docs/zh/changelog/changelog.md	The new v1.6.18 (2026-05-19) release section is added under "🐛 Fixed"/"修复" with multiple client and form-design fix entries listed in both English and Chinese versions.
Link reference updates for v1.6.18 docs/en/changelog/changelog.md, docs/zh/changelog/changelog.md	Bottom link-reference definitions are updated to point "[Unreleased]" from v1.6.18...HEAD and a new "[1.6.18]" release tag URL is added in both language versions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• tegojs/docs#223: Adds v1.6.17 (2026-04-28) release section with fixes and updates the same [Unreleased] and release tag link references.
• tegojs/docs#225: Updates the "guard association parent lookup without source" fix item formatting under the Fixed/未发布 sections in the same changelog files.
• tegojs/docs#204: Modifies the same changelog markdown files by updating Unreleased/release sections and related link references without touching code logic.

Poem

🐰 A changelog grows, release by release,
v1.6.18 brings client peace,
Fixed bugs line by line, so neat,
Both tongues sing: the docs are complete! 📜✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/sync-full-changelog-20260519-114103

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