Remove host visibility and clarify key distribution
NodeVault updates:
- We should not be seeing a physical host here. Scrub other instances where host is visible across the system
- "Send key", "Open backup" is confusing. Should be Next in a standard way

- Remove this suggestion "To avoid"

Outcome
Multi-Node Hosts no longer appear in NodeVault, aren't enrolled for the key, and lose any grant they hold; also gone from NodeLink attach and the Audit node filter. Stepper uses one Next per step; "To avoid" removed. Quick gate + tests green; PR #6740 merged (deploy superseded). Memory: used mem-17993, mem-15203; proposed 0.
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