chore: bump version to 1.1.1

[ai-eks]

Summary

• Base this release preparation on main at b761b53, which includes PR fix: preserve window layout identities across restarts and screen lock #7 but excludes PR fix: keep mouse movement smooth across portal edges #9.
• Bump the application version from 1.1.0 to 1.1.1 and the build number from 20 to 21.
• Update version assertions and version badges in both READMEs.
• Group the 1.1.1 release notes by feature: Window Layout Recovery, Automatic Capture on Lock, and Displays and Portals.
• Keep CHANGELOG.md in English and add CHANGELOG.zh.md with matching Simplified Chinese release notes and historical entries. Add language-switch links and changelog links in both READMEs.
• Credit @JaeHyeon-KAIST for the display and portal fixes in PR fix: preserve layout identity and apply portals across display changes #8.
• Limit changes to version metadata, tests, and documentation; no feature code changes.

Validation

• Updated the version test first and confirmed it failed against the previous version; all 226 tests passed after the bump.
• Release build and local app packaging passed. Verified CFBundleShortVersionString is 1.1.1 and CFBundleVersion is 21 in the packaged Info.plist.
• Verified matching version/date headings and per-version entry counts across both changelogs.
• Confirmed the release-note extraction command correctly selects the 1.1.1 section in both languages. The release workflow remains unchanged and continues to use the English changelog.
• git diff --check passes.

Scope

No release tag was created and no release or notarization workflow was triggered. Version 1.1.1 (21) was installed locally from commit 3dd6382 for user testing; the subsequent changelog update is documentation-only.

[ai-eks]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

Reviewed commit: 30fa93e2ea

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