fix: quote API key header in nginx-demo.conf to prevent empty-value crash

- Wrap ${ANTHROPIC_API_KEY} in quotes so envsubst produces valid nginx
  directive even when the variable is empty
- Skip Docker container polling when runtime is unavailable (stops
  log spam in demo/Portainer deployments)

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

neode-ui/docker/nginx-demo.conf

@@ -77,7 +77,7 @@ http {
             proxy_pass https://api.anthropic.com;
             proxy_ssl_server_name on;
             proxy_set_header Host api.anthropic.com;
-            proxy_set_header x-api-key ${ANTHROPIC_API_KEY};
+            proxy_set_header x-api-key "${ANTHROPIC_API_KEY}";
             proxy_set_header anthropic-version "2023-06-01";
             proxy_set_header Content-Type "application/json";
 

neode-ui/mock-backend.js

@@ -1006,19 +1006,22 @@ server.listen(PORT, '0.0.0.0', async () => {
   console.log('Mock backend is running. Press Ctrl+C to stop.\n')
   
   // Periodically update package data from Docker (merge with static dev apps)
-  setInterval(async () => {
-    const dockerApps = await getDockerContainers()
-    mockData['package-data'] = mergePackageData(dockerApps)
-    
-    // Broadcast update to connected clients
-    broadcastUpdate([
-      {
-        op: 'replace',
-        path: '/package-data',
-        value: mockData['package-data']
-      }
-    ])
-  }, 5000) // Update every 5 seconds
+  // Only poll if container runtime is available (avoids log spam in demo/Docker deployments)
+  if (runtime.available) {
+    setInterval(async () => {
+      const dockerApps = await getDockerContainers()
+      mockData['package-data'] = mergePackageData(dockerApps)
+
+      // Broadcast update to connected clients
+      broadcastUpdate([
+        {
+          op: 'replace',
+          path: '/package-data',
+          value: mockData['package-data']
+        }
+      ])
+    }, 5000) // Update every 5 seconds
+  }
 })
 
 process.on('SIGINT', () => {