chore(release): prepare v1.14.1

[maxlastglance]

What changed

• Bumps the DBRepo application and Helm chart from 1.14.0 to 1.14.1.
• Updates GHCR image references, Java service versions, CI release variables, install assets, API metadata, and documentation.
• Adds the v1.14.1 changelog entry.
• Deduplicates the repeated 1.14 entries in versions.json.
• Makes .scripts/bump-version.sh work on both GNU/Linux and macOS, tolerate the optional overlay values file, update release artifacts consistently, and remain idempotent.

Why

This prepares the patch release containing the fixes accumulated on main, including the explicit Data Service cache port from #93. The resulting Helm chart points to versioned images in GitHub Container Registry.

Validation

• make bump VERSION=1.14.1 completes successfully and is idempotent.
• git diff --check passes.
• versions.json parses and contains one 1.14 entry with the latest alias.
• All 19 changed Maven POM files parse as valid XML.
• Application and chart versions resolve to 1.14.1.
• Confirmed that v1.14.1, GHCR image tags, the OCI Helm chart, and PyPI version 1.14.1 do not already exist.

Known pre-existing validation issue

helm lint helm/dbrepo is blocked by existing values mismatches in vendored chart templates, first at gatewayservice.containerPorts.http and then at dashboardservice.setupJob.backoffLimit. These errors are present independently of this version-only release diff.