OPG-514: Update to Grafana 12.4.0. Add CLAUDE.md. Fix 'npm run dev'

[synqotik]

Grafana just released v12.4.0, so we may as well update. Seems like a lot of changes and bug fixes.

Fixed an issue where npm run dev, i.e. building and running in development mode, was failing.

ForkTsCheckerWebpackPlugin in .config/webpack.config.ts is only created in development mode. Ultimately it makes calls to the ajv library, which were failing.

Basically, ajv has other dependencies like ajv-keywords which all have to be update in step with each other, otherwise things like undefined properties result.

We had to update ajv using overrides due to OSV security issues, and various ajv are used, so this can be tricky.

Used Claude Code to help with that ajv issue, so added a CLAUDE.md as well.

External References

• JIRA (Issue Tracker): http://issues.opennms.org/browse/OPG-514
• Continuous Integration: CircleCI

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[cgorantla]

LGTM!