Add GitHub plugin release imports and update discovery

src/routes/plugins/+page.svelte

@@ -1,5 +1,7 @@
 <script lang="ts">
     import { onMount } from 'svelte';
+    import PluginGithubImport from '$ui/components/PluginGithubImport.svelte';
+    import PluginUpdates from '$ui/components/PluginUpdates.svelte';
     import { artifactVersionLabel } from '$lib/artifact-version.js';
     import Card from '$ui/components/primitives/Card.svelte';
     import Badge from '$ui/components/primitives/Badge.svelte';
@@ -31,6 +33,7 @@
     interface ScopeOptions { games: string[]; mapsByGame: Record<string, string[]>; }
 
     let plugins = $state<ArtifactRow[]>([]);
+    let importCount = $state(0);
     let loading = $state(true);
     let flash = $state<string | null>(null);
     let uploading = $state(false);
@@ -149,6 +152,9 @@
 <div class="page">
     <SectionHeader title="Plugins" subtitle="Native game plugins deployed alongside scripts." />
 
+    <PluginGithubImport onimport={async () => { importCount++; await load(); }} />
+    {#key importCount}<PluginUpdates />{/key}
+
     <Card padding="lg">
         <h2 class="panel-title">Upload a plugin</h2>
         {#if successBanner}