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/views/AppDetails.vue

@@ -28,7 +28,7 @@
         <div class="hidden md:flex items-center gap-6">
           <!-- App Icon -->
       <img
-        :src="pkg['static-files'].icon"
+        :src="pkg['static-files']?.icon || `/assets/img/app-icons/${pkg.manifest?.id || appId}.png`"
         :alt="pkg.manifest.title"
             class="w-20 h-20 rounded-xl shadow-xl flex-shrink-0"
             @error="handleImageError"
@@ -120,7 +120,7 @@
           <div class="flex items-start gap-4 mb-4">
             <!-- App Icon -->
             <img
-              :src="pkg['static-files'].icon"
+              :src="pkg['static-files']?.icon || `/assets/img/app-icons/${pkg.manifest?.id || appId}.png`"
               :alt="pkg.manifest.title"
               class="w-20 h-20 rounded-xl shadow-xl flex-shrink-0"
               @error="handleImageError"