feat(demo): app launch UIs, "No demo" gating, onboarding skip, 12 nodes

App launching (DEMO):
- resolveAppUrl routes every app to its demo target: mock UIs for Bitcoin Core,
  ElectrumX, Fedimint (served by the backend), IndeeHub → iframe indee.tx1138.com,
  Mempool → mempool.space/testnet (new tab); all others → a generic "Demo preview"
  notice page.
- Non-demoable apps show a disabled "No demo" install button (marketplace details,
  app grid, featured apps).

Onboarding:
- Demo treats the visitor as fully set up so the onboarding WIZARD (seed/identity)
  is never forced; the welcome intro still replays per day. Intro CTA goes straight
  to login; wizard entry points + login restart-onboarding link hidden in demo.

Network:
- federation.list-nodes now returns 12 trusted/federated nodes (9 trusted, 3
  observer); transport.peers already at 5.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

neode-ui/src/views/OnboardingIntro.vue

@@ -22,27 +22,30 @@
           @click="goToOptions"
           class="glass-button px-6 py-3 sm:px-8 sm:py-4 rounded-lg text-base sm:text-lg font-medium transition-all hover:bg-black/70 hover:border-white/30 onb-cta"
         >
-          Unlock your sovereignty →
+          {{ isDemo ? 'Enter the demo →' : 'Unlock your sovereignty →' }}
         </button>
 
-        <a
-          tabindex="0"
-          role="button"
-          class="text-white/50 hover:text-white/80 underline text-sm cursor-pointer mt-4 block text-center onb-cta"
-          @click="goToRestore"
-          @keydown.enter="goToRestore"
-        >
-          Restore from seed phrase
-        </a>
-        <a
-          tabindex="0"
-          role="button"
-          class="text-white/50 hover:text-white/80 underline text-sm cursor-pointer mt-2 block text-center onb-cta"
-          @click="goToLogin"
-          @keydown.enter="goToLogin"
-        >
-          Already set up? Log in
-        </a>
+        <!-- Onboarding wizard entry points are hidden in the demo (no seed/identity setup) -->
+        <template v-if="!isDemo">
+          <a
+            tabindex="0"
+            role="button"
+            class="text-white/50 hover:text-white/80 underline text-sm cursor-pointer mt-4 block text-center onb-cta"
+            @click="goToRestore"
+            @keydown.enter="goToRestore"
+          >
+            Restore from seed phrase
+          </a>
+          <a
+            tabindex="0"
+            role="button"
+            class="text-white/50 hover:text-white/80 underline text-sm cursor-pointer mt-2 block text-center onb-cta"
+            @click="goToLogin"
+            @keydown.enter="goToLogin"
+          >
+            Already set up? Log in
+          </a>
+        </template>
       </div>
     </div>
   </div>
@@ -57,6 +60,7 @@ import { IS_DEMO, markDemoIntroSeen } from '@/composables/useDemoIntro'
 
 const router = useRouter()
 const ctaButton = ref<HTMLButtonElement | null>(null)
+const isDemo = IS_DEMO
 
 onMounted(() => {
   // Demo: once the visitor has seen the intro today, don't auto-replay it again
@@ -70,6 +74,13 @@ onMounted(() => {
 
 function goToOptions() {
   playNavSound('action')
+  // Demo: skip the onboarding wizard (seed/identity setup) entirely — go straight
+  // to login, which is prefilled with the demo password.
+  if (isDemo) {
+    localStorage.setItem('neode_onboarding_complete', '1')
+    router.push('/login').catch(() => {})
+    return
+  }
   router.push('/onboarding/path').catch(() => {})
 }