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/OnboardingIntro.vue

@@ -3,7 +3,7 @@
     <div class="max-w-2xl w-full">
       <div class="glass-card p-12 pt-20 text-center relative overflow-visible onb-card">
         <!-- Logo - half in, half out of container -->
-        <div class="absolute -top-10 left-1/2 -translate-x-1/2 z-10 onb-logo">
+        <div class="absolute -top-10 left-0 right-0 flex justify-center z-10 onb-logo">
           <div class="logo-gradient-border w-20 h-20">
             <AnimatedLogo no-border fit />
           </div>