* [AI] fix(daemon): set default --max-old-space-size=8192 in gateway service env
Generate a managed NODE_OPTIONS with --max-old-space-size=8192 for the
gateway systemd service, discarding ambient host NODE_OPTIONS to prevent
--require/--inspect persistence. 8192 MB is chosen as a safe default
that prevents the common OOM crash-loop with the default Node ~4 GB heap
under sustained load.
Related to #96203
* fix(daemon): adapt gateway heap limit to host memory
* fix(daemon): keep gateway heap helpers internal
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Co-authored-by: Peter Steinberger <steipete@gmail.com>