Prepare and publish 0.2.3-preview1

[Skymly]

Scope

Prepare and publish 0.2.3-preview1 after the Singleton lifecycle diagnostics merge.

Checklist

• Update main repository changelog, roadmap, version, and shipped analyzer tracking.
• Update English/Chinese user documentation for async Singleton initialization and package version.
• Pass local CiPack and VitePress build.
• Merge the release/documentation changes, tag v0.2.3-preview1, and verify NuGet/GitHub Packages publication.