style: add menu default textalign

[xrkffgg]

[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
• Perfermance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

close #24228

💡 Background and solution

增加 默认 text-align ，防止上层定义而造成 样式错乱。

📝 Changelog

Language	Changelog
🇺🇸 English	Add Menu default text-align style.
🇨🇳 Chinese	增加 Menu 默认text-align 样式定义以修复被外部样式影响的问题。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

[ant-design-bot]

[codecov]

Codecov Report

Merging #24253 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #24253   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files         363      363           
  Lines        7280     7280           
  Branches     2006     1967   -39     
=======================================
  Hits         7194     7194           
  Misses         86       86           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 32ee08c...c6f69ac. Read the comment docs.