Desktop's readiness probe only checks GET /api/status (public), but the
live chat rides /api/ws, which is gated by --tui (4403), a matching
session token (4401), and a non-loopback bind. The web-dashboard doc
covered --tui and the OAuth gate but never the Desktop remote-connection
flow, so the three independent failure modes weren't documented together.
Adds a 'Connecting Hermes Desktop to a remote backend' section: pin
HERMES_DASHBOARD_SESSION_TOKEN, run with --host 0.0.0.0 --insecure --tui,
the curl token-verification one-liner, and WS close-code triage.
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