release(v1.7.38-alpha): onboarding auto-heal + silent returning logins + app-store trim

- auth.rs now infers onboarding-complete from setup_complete + password_hash so
  nodes stop bouncing users through the intro wizard after browser clear / update
  / reboot; the flag self-heals to disk on next check
- frontend: "backend uncertain" no longer defaults to /onboarding/intro —
  useOnboarding returns null + callers poll / retry instead of flashing the wizard
- login sounds (synthwave, welcome voice, pop, whoosh, oomph) gated by
  isFirstInstallPhase(); typing sounds unaffected
- removed FIPS app, Nostr Relay, Nostr VPN, Routstr, Penpot from catalog,
  frontend config, Rust AppMetadata + install dispatch + install_penpot_stack;
  docker/fips-ui + docker/nostr-vpn-ui + apps/penpot dirs and 5 icons deleted;
  15 image versions deleted from tx1138, .168, gitea-local registries (.160
  Gitea was 502 at release time — follow-up)
- AIUI baked into frontend release tarball via demo/aiui/; deploy-to-target
  falls back to demo/aiui/ when the AIUI sibling checkout is missing
- prebuild hook syncs app-catalog/catalog.json → public/catalog.json so the
  two copies can no longer drift (was the source of the "apps still visible"
  bug — public/ had stale data)

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

neode-ui/src/components/EasyHome.vue

@@ -73,7 +73,6 @@ const APP_ICON_MAP: Record<string, string> = {
   fedimint: '/assets/img/app-icons/fedimint.png',
   mempool: '/assets/img/app-icons/mempool.webp',
   electrs: '/assets/img/app-icons/electrs.svg',
-  'nostr-rs-relay': '/assets/img/app-icons/nostr-rs-relay.svg',
 }
 
 function goalAppIcons(goal: GoalDefinition): { appId: string; url: string }[] {