docs: adopt system-health-check workflow and host inventories

The workflow and the four host capability inventories move here from the home project. System maintenance is archsetup's domain, and this puts the thresholds TOML and both of its consumers in one repo.

The workflow's prose severity rules now cite the installed TOML keys, and the TOML wins on disagreement. Inventory paths point at docs/homelab-inventory/. A note routes routine ratio/velox checks to the maint CLI, leaving this workflow for the non-Arch hosts and forensic deep dives.

Only the #+HOSTNAME: capability inventories moved (ratio, velox, mybitch, truenas, plus the truenas hardware-specs asset they link). The personal gear records stay in home, and the home-side removal is handed off through its inbox.

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