Add /hosts/:id detail page with unified timeline (HostEvents + FMs + Repairs
+ part arrivals/departures) and a deployed-parts table. Hosts list rows now
link to the page. FM list + detail surface inline State/Stack badges next
to the asset ID, with the asset ID linking to the host page.
HostEvent audit model added; create/update in the hosts service now diff
and log state, stack, and field changes the same way parts.ts does.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
