Add native image support for check-consistency and check-integrity commands

[wanling0000]

Related issues and pull requests

Closes no related issue.

This PR is part of JabRef components as native images project.

PR Description

Add GraalVM native image reachability metadata for check-consistency and check-integrity commands, including picocli field reflection and SnuggleTeX resources.

See the metadata provenance doc for details.
jabref-contrib-policy:4.2:reviewed​:ok

Steps to test

1. Build native binary: ./gradlew :jabkit:nativeCompile
2. Run: jabkit/build/native/nativeCompile/jabkit check consistency --input=<path-to>.bib ./build/native/nativeCompile/jabkit check consistency
   Expected: consistency report
3. Run: jabkit/build/native/nativeCompile/jabkit check integrity --input=<path-to>.bib
   Expected: integrity report
4. Run smoke tests via clitest:

        cd jabkit && clitest src/test/nativeimage/jabkit.md

   Expected: all 3 tests pass (--help, check-consistency, check-integrity)

AI usage

Claude Code (claude-sonnet-4-6) was used for discussion and emotional support.

Checklist

• I own the copyright of the code submitted and I license it under the MIT license
• If AI tools were used, I disclosed them in the "AI usage" section and reviewed, understood, and take full ownership of all AI-generated code
• I manually tested my changes in running JabRef (always required)
• [/] I added JUnit tests for changes (if applicable)
• [/] I added screenshots in the PR description (if change is visible to the user)
• [/] I added a screenshot in the PR description showing a library with a single entry with me as author and as title the issue number
• [/] I described the change in CHANGELOG.md in a way that can be understood by the average user (if change is visible to the user)
• [/] I checked the user documentation for up to dateness and submitted a pull request to our user documentation repository