docs(readme): add status badges to both READMEs

[BlackHole1]

Add a badge row under the language switcher in the English and Simplified Chinese READMEs so the repository's health and metadata are visible at a glance: CI status, latest release, Homebrew tap, platform, language, and license.

CI, release, and license badges are served by shields.io dynamic endpoints that track the repo automatically. The Homebrew badge is static because the custom tap (oomol-lab/tap) is not covered by the shields Homebrew endpoint.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b52b79e6-685a-457c-bfe0-ef69153d5be6

📥 Commits

Reviewing files that changed from the base of the PR and between 9253003 and d5a02b1.

📒 Files selected for processing (2)

• README.md
• README.zh-CN.md

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Summary by CodeRabbit

• Documentation
  • Added prominent status and metadata badges near the top of the English and Chinese README files.
  • Included badges for CI status, latest release, Homebrew availability, macOS support, language, and license.

Walkthrough

README.md and README.zh-CN.md now include a set of status and metadata badges near the top of each document. The added badges cover CI workflow status, latest release, Homebrew tap availability, macOS platform, Objective-C language, and license.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses the required format <type>(<scope>): <subject> with 'docs' as type and 'readme' as scope, clearly summarizing the main change of adding status badges to READMEs.
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose of adding status badges to both README files and detailing their sources and functionality.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch docs/readme-badges

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