docs: update citations

[Ki-Seki]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances the citation section by adding a note about the short version’s release and splitting the single citation into separate entries for the short and long versions of the paper.

• Added a callout highlighting the short version’s release date
• Replaced the single BibTeX entry with two entries (short and long versions)
• Updated the citation instructions accordingly

Comments suppressed due to low confidence (3)

README.md:199

• GitHub Markdown does not support the [!NOTE] admonition syntax. Consider using a standard blockquote (e.g., > Note:) or bold text to ensure the note renders correctly on GitHub.

> [!NOTE]

README.md:204

• [nitpick] For proper syntax highlighting of BibTeX entries on GitHub, it's recommended to use ```bibtex instead of ```bib as the code fence language identifier.

```bib

README.md:197

• [nitpick] Since the section now references multiple papers, consider renaming the heading to ## 📜 Citations to reflect the plural form.

## 📜 Citation