Docs/add pictogram demo

[Eomnational]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Refactoring
• Update dependency
• Code style optimization
• Test Case
• Branch merge
• Release
• Site / documentation update
• [√] Demo update
• Workflow
• Other (about what?)

🔗 Related issue link

#3557

🔗 Related PR link

🐞 Bugserver case id

💡 Background and solution

Demo展示了一个心脏医学示意图：

心脏医学示意图展示了心脏的基本组成结构。有心底、主动脉、肺动脉、静脉。
每个不同的颜色表示心脏不同的组成成分。

关键配置

• 通过 VChart.registerSVG 接口来注册 svg 资源；
• svg 属性声明为注册的 svg 名称；
• 使用 color 配置项为不同的心脏部分指定颜色；

📝 Changelog

Language	Changelog
🇺🇸 English	By using pictograms, medical researchers and doctors can quickly understand the structure of the heart, providing a reference for medical research and clinical diagnosis.
🇨🇳 Chinese	通过使用象形图，医学研究者和医生可以快速了解心脏的结构，为医学研究和临床诊断提供参考

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• [√ ] Doc is updated/provided or not needed
• [√] Demo is updated/provided or not needed
• [√ ] TypeScript definition is updated/provided or not needed
• [√ ] Changelog is provided or not needed

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🚀 Summary

copilot:summary

🔍 Walkthrough

copilot:walkthrough