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/Dockerfile.web

@@ -29,12 +29,16 @@ FROM nginx:alpine
 # Copy built files to nginx
 COPY --from=builder /app/dist /usr/share/nginx/html
 
-# Copy nginx configuration
-COPY neode-ui/docker/nginx.conf /etc/nginx/nginx.conf
+# Copy AIUI pre-built dist
+COPY demo/aiui/ /usr/share/nginx/html/aiui/
+
+# Copy nginx config template and entrypoint
+COPY neode-ui/docker/nginx-demo.conf /etc/nginx/nginx.conf.template
+COPY neode-ui/docker/docker-entrypoint.sh /docker-entrypoint-custom.sh
+RUN chmod +x /docker-entrypoint-custom.sh
 
 # Expose port
 EXPOSE 80
 
-# Start nginx
-CMD ["nginx", "-g", "daemon off;"]
-
+# Substitute ANTHROPIC_API_KEY at runtime, then start nginx
+ENTRYPOINT ["/docker-entrypoint-custom.sh"]