* feat(gateway): add system.info RPC and Gateway Host card in Settings
Settings quick page now shows where the Gateway runs and how the host
is doing: machine name, LAN address and runtime port, OS, Node/PID,
uptime, CPU count and load, RAM, and free disk on the state-dir volume.
Backed by a new additive operator.read RPC (system.info); the card
polls every 10s while visible and hides for clients without the read
scope or against older gateways.
Refs #100465
* docs: regenerate docs map for Gateway host status section
* fix(gateway): harden system info compatibility
* fix(ui): clear stale gateway host info
* docs(changelog): note gateway host status
2bed394793
