feat(gen-ai): Add POST /nemo-guardrails/init BFF endpoint

[NickGagan]

Issue: https://redhat.atlassian.net/browse/RHOAIENG-54547

Description

Adds a new endpoint to create and update NemoGuardrails K8s resources (per-model ConfigMaps + NemoGuardrails CR) from the same model list used for LSD install. Model source type is encoded in resource names (e.g. guardrail-maas-granite-3b) for downstream discoverability. Subsequent calls upsert existing resources and clean up stale ConfigMaps.

How Has This Been Tested?

TODO

Test Impact

TODO

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