/portal overview: client's active sound locations as live tiles (current Lp +
Live/Stopped badge + "updated Xm ago", polled from the scoped cache every 15s)
plus a Leaflet map of locations with coordinates. /portal/location/{id}: 404-gated
read-only live panel — Lp/Leq/Lmax/L1/L10 cards + a 4-line Chart.js trace
(backfilled from /history) + measuring/freshness badge. Cache-only, 15s poll, no
device controls, no refresh-from-device. _client_locations() feeds the overview.
Verified: portal.py compiles; both inline scripts balance; all four portal
templates parse in Jinja2.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
backend/portal_auth.py: stdlib HMAC-signed session cookie carrying the access-
token id (re-validated against the DB each request, so revoke kills live
sessions), hash_token, resolve_token, and the get_current_client dependency
(raises PortalAuthError). SECRET_KEY env (insecure dev default + warning).
routers/portal.py: /portal/enter/{token} mints the cookie -> /portal; /logout;
/access; /portal home stub. main.py registers the router + a PortalAuthError
handler (HTML access page for pages, 401 JSON for /portal/api/*).
Portal shell templates (base, access_required, overview stub), branded dark.
Verified: cookie round-trip + tamper/garbage rejection, token resolution
(valid/bad), get_current_client (valid/no-cookie/revoked) — 8/8 against a temp DB.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>