feat(fips): integrate jmcorgan/fips as preferred non-Tor transport + v1.4.0

Bakes the FIPS (Free Internetworking Peering System) mesh daemon into
the node stack, supervised by archipelago alongside Tor. Runs as a
system service, identity derives from the same BIP-39 master seed, and
user-triggered updates track upstream main.

Identity
  seed.rs: new HKDF label archipelago/fips/secp256k1/v1 → dedicated
  secp256k1 key, distinct from the Nostr-node key for crypto isolation
  but still seed-recoverable
  identity.rs: writes fips_key[.pub] to /data/identity on onboarding,
  chmod 0600; fips_key_exists / load_fips_keys / fips_npub accessors

Transport
  TransportKind::Fips=3 inserted between LAN and Tor (Tor bumps to 4)
  → router prefers FIPS over Tor for all peer traffic
  PeerRecord gains fips_npub + last_fips fields (serde(default) for
  backward-compat with older nodes)
  transport/fips.rs: NodeTransport stub, reports unavailable until the
  daemon is live so router falls through to Tor cleanly

Federation invites
  FederatedNode and FederationInvite carry optional fips_npub
  create_invite / accept_invite / peer-joined callback thread it end
  to end; signature domain deliberately unchanged — FIPS Noise does
  its own session auth, so the unsigned hint only affects path
  selection

crate::fips
  config.rs: renders /etc/fips/fips.yaml and sudo-installs key material
  service.rs: systemctl status/activate/restart/mask wrappers
  update.rs: GitHub API check against upstream main; apply stubbed
  until per-commit .deb artefact source is decided

RPC + dashboard
  fips.status / fips.check-update / fips.apply-update / fips.install /
  fips.restart registered in dispatcher
  HomeNetworkCard.vue shipped standalone (unmounted — place in Home.vue
  when ready); shows state pill, version, FIPS npub, update button,
  activate button when key is present but service is down

ISO + systemd
  archipelago-fips.service: conditional on key presence, masked by
  default — backend unmasks after onboarding writes the key
  build-auto-installer-iso.sh: multi-stage Dockerfile builds the FIPS
  .deb from jmcorgan/fips main (fail-loud), COPYs it into rootfs, apt
  installs it so trixie resolves deps; unit copied + masked

Version bump: 1.3.5 → 1.4.0

Tests: 33 new/updated passing (seed, identity, transport, federation,
fips module, transport::fips).

Known gaps: fips.apply-update returns a clear stub error until
upstream publishes per-commit .deb artefacts; HomeNetworkCard is not
mounted in Home.vue by default.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/Cargo.lock

@@ -80,7 +80,7 @@ checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
 
 [[package]]
 name = "archipelago"
-version = "1.3.5"
+version = "1.4.0"
 dependencies = [
  "anyhow",
  "archipelago-container",