fix(fips): fall back to upstream daemon npub on legacy/dev nodes

Nodes without a seed-derived FIPS key (legacy deploys, fresh pre-onboarding
installs) were reporting "Awaiting seed" in the dashboard even when the
upstream fips.service was running — status.npub was None unless
/data/identity/fips_key.pub existed.

- fips/service.rs: new read_upstream_npub() reads /etc/fips/fips.pub
  (bech32 text or raw 32 bytes) from the debian package.
- fips/mod.rs: FipsStatus::current() prefers the seed-derived npub,
  falls back to the upstream key. service_active is now TRUE if either
  archipelago-fips.service OR upstream fips.service is active; adds
  upstream_service_state to the status payload.
- fips/update.rs: resolve the upstream default branch from the GitHub
  repo API (jmcorgan/fips is on `master`, not `main`) instead of
  hardcoding — future repo rename just works.
- network/router.rs + api/rpc/router.rs: diagnostics gain wifi_ssid from
  `nmcli -t device` so the Network card can show the connected SSID.
- UI: Home.vue adds a FIPS row to the Local Network card; Server.vue
  mounts the new FipsNetworkCard and shows SSID + FIPS Mesh rows;
  HomeNetworkCard.vue removed (superseded by the inline rows).

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

core/archipelago/src/api/rpc/router.rs

@@ -100,6 +100,7 @@ impl RpcHandler {
             "tor_connected": diag.tor_connected,
             "dns_working": diag.dns_working,
             "recommendations": diag.recommendations,
+            "wifi_ssid": diag.wifi_ssid,
         }))
     }