docs: Automated Changelog Update for v5.0.0-alpha2

[sealos-release-robot]

🤖 Generated by Copilot at 5424bae

Summary

🐛🚀📝

Update and fix ./CHANGELOG/CHANGELOG.md file. This file documents the changes and features of each release of the sealos project.

Sing, O Muse, of the changelog of the code
That records the deeds of the skillful ones
Who craft the software with their nimble minds
And fix the errors of the past with care.

Walkthrough

• Add link to changelog for 5.0.0-alpha2 release, which introduces breaking changes and new features (link)
• Reverse order of changelogs for 4.3.x releases to match chronological order (link)

Automated changes by create-pull-request GitHub action

[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	375
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	580
❓ Unknown	0
🚫 Errors	0

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