Enhance Docker image pulling process and remove Bitcoin Core UI

- Improved the Docker image pulling process in the startup script with a spinner for better user feedback.
- Added a tip for monitoring progress in Docker Desktop.
- Removed the Bitcoin Core HTML UI file as it is no longer needed; replaced with connection info alert in the app view.
- Updated the app view to provide direct connection details for Bitcoin Core instead of opening a separate page.

neode-ui/src/views/Apps.vue

@@ -185,9 +185,11 @@ function launchApp(id: string) {
   const isDev = import.meta.env.DEV
   const pkg = packages.value[id]
   
-  // Special handling for Bitcoin Core - open standalone HTML page in new tab
+  // Special handling for Bitcoin Core - it's a headless node with no web UI
+  // Just show connection info instead
   if (id === 'bitcoin') {
-    window.open('/bitcoin-core.html', '_blank', 'noopener,noreferrer')
+    const rpcPort = pkg?.installed?.lanAddress?.match(/:(\d+)/)?.[1] || '18443'
+    alert(`✅ Bitcoin Core is running!\n\n🔗 RPC Endpoint: http://localhost:${rpcPort}\n👤 User: bitcoin\n🔑 Password: bitcoinpass\n\n💡 Use bitcoin-cli or an RPC client to interact.\n📊 View blockchain data in Mempool: http://localhost:4080`)
     return
   }