fix: prevent My Apps crash when installing apps + add filebrowser to demo

The My Apps page went blank after installing apps because pkg['static-files'].icon
was accessed without optional chaining on dynamically installed packages that lack
the static-files property.

- Make static-files optional in PackageDataEntry type
- Add defensive ?.icon access with fallback in Apps.vue and AppDetails.vue
- Add filebrowser to mock backend staticDevApps (enables Cloud page in demo)
- Expand portMappings and marketplaceMetadata for all marketplace apps
- installPackage now uses staticApp() format for consistent data shape

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

docker-compose.demo.yml

@@ -14,12 +14,18 @@ services:
     environment:
       VITE_DEV_MODE: "existing"  # Skip setup/onboarding, go straight to login
       ANTHROPIC_API_KEY: ${ANTHROPIC_API_KEY:-}
+      NODE_OPTIONS: "--dns-result-order=ipv4first"
     expose:
       - "5959"
     dns:
       - 8.8.8.8
       - 1.1.1.1
     restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://127.0.0.1:5959/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
 
   neode-web:
     build: