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/FileCard.vue

@@ -50,6 +50,15 @@
 
     <!-- Actions -->
     <div class="cloud-file-item-actions" @click.stop>
+      <button
+        class="cloud-file-action-btn cloud-file-action-share"
+        title="Share with peers"
+        @click.stop="$emit('share', item.path, item.name, item.isDir)"
+      >
+        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8.684 13.342C8.886 12.938 9 12.482 9 12c0-.482-.114-.938-.316-1.342m0 2.684a3 3 0 110-2.684m0 2.684l6.632 3.316m-6.632-6l6.632-3.316m0 0a3 3 0 105.367-2.684 3 3 0 00-5.367 2.684zm0 9.316a3 3 0 105.368 2.684 3 3 0 00-5.368-2.684z" />
+        </svg>
+      </button>
       <a
         v-if="!item.isDir"
         :href="downloadHref"
@@ -92,6 +101,7 @@ const props = defineProps<{
 const emit = defineEmits<{
   navigate: [path: string]
   delete: [path: string]
+  share: [path: string, name: string, isDir: boolean]
 }>()
 
 const cloudStore = useCloudStore()