Adds docs/STAGING_FLEETOPS_ARCHITECTURE.md — the project doc for splitting
fleet tracking (FleetNow, frozen prod) from fleet operations (FleetOps, new
SPA) and standing up a staging environment under the fivetitude.com wildcard.
Covers: target topology + env matrix, the two dashboard_api instances
(prod 8890 / staging 8891, read-only role, refresher off), Forgejo->Coolify
webhook deploy + branch promotion model, FleetOps SPA on Caddy (Traefik still
terminates TLS), shared prod read-layer safety model, 6-phase rollout, and a
verification checklist.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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