Fix CITATION.cff top-level metadata

[kernelpanic888]

Related to #1916.

This keeps the existing article citation as preferred-citation, and adds the required top-level CFF metadata for the software itself: cff-version, message, type, title, authors, repository, URL, license, and keywords.

I intentionally did not change the existing preferred article citation.

Local checks:

• parsed CITATION.cff as YAML and checked that cff-version and preferred-citation are present;
• git diff --check.

I could not run cffconvert --validate locally because cffconvert is not installed in this environment.

Summary by CodeRabbit

• Documentation
  • Added citation information for DP-GEN, including how to reference the software, project details, author information, repository and documentation links, license, and keywords.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1eecf396-82d8-402a-ad0d-2f483e9ed6ef

📥 Commits

Reviewing files that changed from the base of the PR and between 932afac and b65461b.

📒 Files selected for processing (1)

• CITATION.cff

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📝 Walkthrough

Walkthrough

Added a new CITATION.cff file containing citation metadata for the DP-GEN software, including citation format version, guidance message, software type, title, abstract, author information, repository and documentation URLs, license, and keywords.

Changes

Citation File Addition

Layer / File(s)	Summary
Add CITATION.cff metadata CITATION.cff	New file defining citation format version, message, software type, title, abstract, authors, repository-code, url, license, and keywords for DP-GEN.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Related Issues: None specified

Related PRs: None specified

Suggested Labels: documentation

Suggested Reviewers: None specified

🐰 A tiny file, crisp and new,
Tells the world how to cite DP-GEN true,
With authors, license, and a URL bright,
CITATION.cff hops into the light!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: updating CITATION.cff top-level metadata.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.80%. Comparing base (932afac) to head (b65461b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1921   +/-   ##
=======================================
  Coverage   49.80%   49.80%           
=======================================
  Files          83       83           
  Lines       14986    14986           
=======================================
  Hits         7464     7464           
  Misses       7522     7522           

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[wanghan-iapcm]

LGTM, thanks for the contribution!