docs: fix broken star history chart

[OctoBored]

The star history chart in the README is currently broken because the previous chart service is affected by GitHub stargazer API restrictions. This change points the chart to a working service so the star history renders correctly again.

Summary by CodeRabbit

• Documentation
  • Updated the Star History badge and link to use the new Star History website address.

[vercel]

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[what-the-diff]

PR摘要

• 更新了“Star历史图表”链接
  更新后的链接将使用新域名（star-history.dera.page）。我们对此改变确保了连接的稳定性，提升了用户浏览体验。

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 597fdaf0-8930-4e40-8926-face2cce779d

📥 Commits

Reviewing files that changed from the base of the PR and between ba5073f and ca7d392.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README Star History badge now uses star-history.dera.page for both the chart image and destination link.

Changes

Star History Update

Layer / File(s)	Summary
Update Star History badge link README.md	The Star History badge image and destination URL now use star-history.dera.page.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Mergeability Score: ⚪ Minimal · up to ca7d3

This is a localized README-only change to restore the star history chart, and no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the README change that fixes the broken star history chart.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud