Docs: add "Expose multiple ports"

[yangchuansheng]

🤖 Generated by Copilot at 0c272e7

Summary

🔗📄✏️

This pull request adds a new document expose-multi-ports.md and its Chinese version to the Sealos documentation website, and updates the links and titles of related documents. The purpose is to provide users with more guidance on how to expose multiple ports for their applications on Sealos.

expose-multi-ports
New docs for Sealos users
Autumn wind of change

Walkthrough

• Add a new document expose-multi-ports.md to explain how to expose multiple ports for applications on Sealos (link, link)
• Add a link to the new document in the Next Steps section of the quick-start/app-deployments/next-steps.md document in both English and Chinese versions (link, link)
• Add the new document to the sidebar menu of the documentation website (link)
• Fix a typo in the title of the quick-start/update-app.md document in the Chinese version (link)

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: Leftover TODOs in the code should be handled.
• Apply: All new business logic should have corresponding unit tests in the tests/ directory.
• Apply: Any clearly inefficient or repeated code should be optimized or refactored.

[sealos-ci-robot]

🤖 Generated by lychee action

Summary

Status	Count
🔍 Total	956
✅ Successful	374
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	580
❓ Unknown	0
🚫 Errors	1

Errors per input

Errors in staging/src/github.com/labring/controllers/cluster/README.md

• [503] https://developer.arm.com/documentation/102475/0100/Multi-architecture-images | Failed: Network error: Service Unavailable

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