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>

neode-ui/src/stores/app.ts

@@ -116,7 +116,6 @@ export const useAppStore = defineStore('app', () => {
         }
         // Handle real backend format: {rev: 0, data: {...}}
         else if (update?.data && update?.rev !== undefined) {
-          console.log('[Store] Received dump from real backend at revision', update.rev)
           data.value = update.data
           isConnected.value = true
           isReconnecting.value = false