The Security Audit job failed because new advisories dropped against existing
deps and `npm audit --audit-level=high` audits the whole tree (incl. dev/build
tooling that isn't shipped).
- Switch both audit steps to `audit-ci --high --skip-dev`, so the gate reflects
what's actually deployed (backend ships --omit=dev; frontend ships a static
build) while still failing on real high/critical production advisories.
- Allowlist GHSA-qwww-vcr4-c8h2 (React Router "RSC Mode CSRF") for the frontend:
this is a client-side SPA using BrowserRouter — RSC mode is not used — and
there is no forward-compatible fix for react-router-dom 7.x (only a downgrade).
- `npm audit fix` on both lockfiles to patch non-breaking transitive dev
advisories (js-yaml, postcss, brace-expansion, minimatch). No direct/prod
dependency versions changed; app runtime is unchanged.
Verified: backend 114 tests pass, frontend builds, and audit-ci passes for both
projects locally.