Complete private authentication, server integrations and activity reporting

Add Fabric/Forge version builds and Paper integration, preserve permanent player identities across renames, harden session authorization, and surface privacy-conscious launcher/server activity in the panel.

panel/web/src/App.svelte

@@ -11,6 +11,7 @@
   import Servers from './pages/Servers.svelte';
   import ServerDetail from './pages/ServerDetail.svelte';
   import Capes from './pages/Capes.svelte';
+  import Activity from './pages/Activity.svelte';
   import { get } from './lib/api';
   import { route } from './lib/router.svelte';
   import { logout, session, type Me } from './lib/session.svelte';
@@ -64,6 +65,8 @@
           <Servers />
         {:else if route.name === 'capes'}
           <Capes />
+        {:else if route.name === 'activity'}
+          <Activity />
         {:else if route.name === 'users'}
           <Users />
         {:else if route.name === 'branding'}