Adds a "View client portal" button on the project detail page that opens the
client portal scoped to that project — no CLI. GET /projects/{id}/portal-preview
auto-provisions a client + access token for the project (provision_preview_session)
and seals a portal session cookie, then redirects to /portal.
- Reuses the project's linked client if it has one; otherwise creates/reuses a
per-project 'preview-<id>' client. Only sets project.client_id when unset, so it
never clobbers a real client link. Idempotent — repeat clicks reuse the same
client/token.
- Lives under /projects (not /portal), so a future public proxy exposing only
/portal/* won't expose this operator shortcut.
Verified: provisioning (unlinked creates+links, idempotent, linked-no-clobber) 7/7.
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>