The SPA can't carry an Authentik session on its own fetch() XHRs in
all cases (cross-origin redirect to authentik.viktorbarzin.me on a
stale cookie returns HTML, fetch().json() parse fails). Splitting
the ingress so /api/ paths skip forward-auth lets the React app talk
to its API end-to-end. The browser still has to log in via
Authentik to load the SPA at /.
Verified end-to-end via chrome-service Playwright: dashboard load,
scenario list, what-if run with real Monte Carlo, save-as-scenario
round-trip, run-now on detail, delete — all pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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