CI Pipeline / Rust Format Check (push) Successful in 8s
CI Pipeline / Clippy Lints (push) Successful in 50s
CI Pipeline / Rust Unit Tests (push) Successful in 1m8s
CI Pipeline / Security Audit (push) Successful in 5s
CI Pipeline / Frontend Lint & Type Check (push) Successful in 15s
CI Pipeline / Build .deb & Release (push) Has been skipped
Encrypt three sensitive secrets that were stored in plaintext: OIDC client_secret, SMTP smtp_password, TOTP totp_secret. AES-256-GCM via pm-core::crypto helper. New per-install key at /etc/patch-manager/keys/secret-encryption.key, separate from health-check.key for blast-radius isolation. MASKED placeholder behavior in API responses is preserved.
23 files changed, +1248 / -28. Closes#6.
Replaces URL-embedded JWT tokens with a single-use, 60-second handoff code that the SPA exchanges via server-to-server POST. The URL now contains only `?handoff=<code>` — no tokens are placed in the browser history, proxy access logs, or Referer header.
Backend: new SsoHandoff store (DashMap, 60s TTL, atomic DashMap::remove for single-use), POST /api/v1/auth/sso/handoff endpoint, 7 new tests.
Frontend: SsoCallbackPage rewritten to use useSearchParams + POST exchange, with history.replaceState to clear the handoff code from the address bar. Switched from window.location.search to useSearchParams() for test compatibility. New Vitest infrastructure (vitest, @testing-library/react, jsdom) and 6 new tests.
CI fix in ccba9e3: cargo fmt --all and added searchParams to useEffect dep array to satisfy CI's Rust Format and Frontend Lint checks.
Refs: closes#4
