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>

apps/penpot/Dockerfile

@@ -1,5 +0,0 @@
-# Penpot - uses official image
-FROM penpot/penpot:latest
-
-# Default configuration is in the image
-# No additional setup needed

apps/penpot/manifest.yml

@@ -1,51 +0,0 @@
-app:
-  id: penpot
-  name: Penpot
-  version: 2.0.0
-  description: Open-source design and prototyping platform. Design tools for teams.
-  
-  container:
-    image: penpotapp/frontend:2.13.3
-    image_signature: cosign://...
-    pull_policy: if-not-present
-    
-  dependencies:
-    - storage: 10Gi
-    
-  resources:
-    cpu_limit: 4
-    memory_limit: 4Gi
-    disk_limit: 10Gi
-    
-  security:
-    capabilities: []
-    readonly_root: true
-    no_new_privileges: true
-    user: 1000
-    seccomp_profile: default
-    network_policy: isolated
-    apparmor_profile: penpot
-    
-  ports:
-    - host: 8089
-      container: 80
-      protocol: tcp  # Web UI
-    
-  volumes:
-    - type: bind
-      source: /var/lib/archipelago/penpot
-      target: /app/data
-      options: [rw]
-      
-  environment:
-    - PENPOT_PUBLIC_URI=http://localhost:8089
-    - PENPOT_DATABASE_URI=postgresql://penpot:penpot@penpot-db:5432/penpot
-    - PENPOT_REDIS_URI=redis://penpot-redis:6379
-    
-  health_check:
-    type: http
-    endpoint: http://localhost:8089
-    path: /api/health
-    interval: 30s
-    timeout: 5s
-    retries: 3