修复星标历史图无法显示的问题

[FaintFlower]

README 中的星标历史图目前因 GitHub API 限制而无法正常显示。此 PR 将星标历史图切换到新的数据源地址，确保图表恢复正常展示。

Summary by CodeRabbit

• Documentation
  • Updated Star History chart links and image sources to use the current hosting domain.

[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: 5e386fa5-cd27-4e70-8fc9-89513a8c6b3e

📥 Commits

Reviewing files that changed from the base of the PR and between c501cb8 and 812b264.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md Star History anchor and chart image sources now use star-history.dera.page instead of the previous hosts.

Changes

Star History URL update

Layer / File(s)	Summary
Update README Star History links README.md	The Star History anchor and chart image sources now use star-history.dera.page.

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

Merge Risk: ⚪ Minimal · up to 812b2

该 PR 仅更新 README 中的星标历史图地址，当前浅色和深色图表端点均可正常返回有效 SVG 内容；没有剩余的可执行合并阻塞风险。

Suggested reviewers: tc999

🚥 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	标题准确概括了修复星标历史图无法显示这一主要变更。
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

🧪 Generate unit tests (beta)

• Create PR with unit tests

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