feat: demo deployment with AIUI chat, SSH key auth, Quick Start fix

- Add AIUI pre-built dist to demo/ for Portainer deployment
- Add nginx-demo.conf with Claude API proxy (envsubst for API key)
- Add docker-entrypoint.sh for runtime API key injection
- Update Dockerfile.web to include AIUI and Claude proxy
- Update docker-compose.demo.yml with ANTHROPIC_API_KEY env var
- Switch deploy script from sshpass to SSH key auth
- Fix Quick Start Goals animating before other cards (stagger 5, opacity guard)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/views/Home.vue

@@ -250,9 +250,9 @@
     <!-- Quick Start Goals - shown in Pro mode below the overview cards -->
     <div
       v-if="homeTab === 'dashboard' && showQuickStart"
-      class="home-card"
-      :class="{ 'home-card-animate': animateCards }"
-      style="--card-stagger: 4"
+      class="home-card transition-opacity duration-300"
+      :class="{ 'home-card-animate': animateCards, 'opacity-0 pointer-events-none': showWelcomeBlock && !animateCards }"
+      style="--card-stagger: 5"
     >
       <div class="home-card-shell">
         <div class="home-card-inner px-6 py-6">