chore: bump version to 4.27.4

[Soulter]

What changed

• bumped the package version from 4.27.3 to 4.27.4
• added polished English and Chinese release notes for changes since v4.27.3

Why

Prepare the 4.27.4 patch release with the fixes, Dashboard improvements, and maintenance updates already merged into master.

User impact

After merge and tagging, users can install and identify AstrBot 4.27.4 and review a concise bilingual changelog.

Validation

• uv run ruff format .
• uv run ruff check .
• git diff --check

Summary by Sourcery

Bump AstrBot to version 4.27.4 and publish bilingual release notes for the patch release.

Enhancements:

• Prepare the 4.27.4 patch release with updated version metadata and a bilingual changelog covering recent fixes and maintenance improvements.

Documentation:

• Add polished English and Chinese release notes for version 4.27.4.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}