fix: add deprecated token warning

[MadCcc]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
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🔗 Related issue link

close #43447

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Add warning for deprecated token colorItemBgSelected.
🇨🇳 Chinese	为已废弃的组件 Token colorItemBgSelected 添加警告。

☑️ 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

🤖 Generated by Copilot at 71fab75

Add a new theme variable colorItemBgSelected to customize the menu item selected background color. Update components/menu/style/index.tsx to support this variable.

🔍 Walkthrough

🤖 Generated by Copilot at 71fab75

• Add a new style property colorItemBgSelected to customize the background color of the selected menu item (link)

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size-limit report 📦

Path	Size
./dist/antd.min.js	377.29 KB (+5 B 🔺)
./dist/antd-with-locales.min.js	436.76 KB (+5 B 🔺)