Introduce GitLab release helpers and use them to conditionally update Storyteller.
- misc/tools.func: add get_latest_gitlab_release and check_for_gl_release functions (GitLab API calls, token support, pinning, error handling, requires jq).
- ct/storyteller.sh: wrap update sequence with check_for_gl_release so rebuild/deploy only runs when a new GitLab release is detected; update author metadata.
- install/storyteller-install.sh: remove python3 from apt dependencies and drop NODE_OPTIONS export; minor whitespace cleanup.
These changes prevent unnecessary rebuilds by detecting upstream GitLab releases and improve robustness of release detection and error reporting.
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