Automate host preparation and speed up game file downloads

src/lib/ui/components/DeployCollectionDialog.svelte

@@ -17,7 +17,7 @@
     let mode = $state<CollectionMode>('fill');
     let games = $state<ZombieGame[]>([]);
     let collectionName = $state('Launch collection');
-    let hostSelection = $state<NativeDeploymentSelection>({ hostId: '', libraryIds: {}, image: 'ghcr.io/ayymoss/plutainer:latest' });
+    let hostSelection = $state<NativeDeploymentSelection>({ hostId: '', libraryIds: {}, image: '' });
     let hostReady = $state(false);
     let confirmRemovals = $state(false);
     let keys = $state<Record<string, string>>({});
@@ -41,7 +41,7 @@
 
     async function initialize() {
         const current = ++session; busy = true; error = ''; games = []; hostReady = false;
-        hostSelection = { hostId: '', libraryIds: {}, image: 'ghcr.io/ayymoss/plutainer:latest' };
+        hostSelection = { hostId: '', libraryIds: {}, image: '' };
         try {
             const response = await fetch('/api/blueprints'); const body = await response.json();
             if (!response.ok) throw new Error(body.error ?? 'Could not load collection.');