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/components/cloud/FileGrid.vue

@@ -40,6 +40,7 @@
         @navigate="$emit('navigate', $event)"
         @delete="$emit('delete', $event)"
         @play="(path, name) => $emit('play', path, name)"
+        @share="(path, name, isDir) => $emit('share', path, name, isDir)"
       />
     </div>
 
@@ -51,6 +52,7 @@
         :item="item"
         @navigate="$emit('navigate', $event)"
         @delete="$emit('delete', $event)"
+        @share="(path, name, isDir) => $emit('share', path, name, isDir)"
       />
     </div>
   </div>
@@ -73,5 +75,6 @@ defineEmits<{
   navigate: [path: string]
   delete: [path: string]
   play: [path: string, name: string]
+  share: [path: string, name: string, isDir: boolean]
 }>()
 </script>