refactor(webui): regroup core/ui + core/boot into named subsystems

Final structural phase — the catch-all core/ui/ is gone and core/boot/ keeps
only the genuine bootstrap pipeline:

  core/ui/eo-modal.js, confirmation-dialog.js   -> core/overlays/
  core/ui/notifications.js                       -> core/notifications/
  core/ui/topbar.{js,html}, mobile-menu.js       -> core/topbar/
  core/ui/update-notifier.js                     -> core/update-notifier/
  core/ui/backup-app-card.js                     -> core/backup-card/  (shared widget)
  core/boot/controls/                            -> core/forms/controls/
  core/boot/setup/                               -> core/setup/
  core/boot/loading-ui.js                        -> core/loading/
  core/boot/auth-manager.js                      -> core/boot/auth/

Each subsystem now owns its JS + CSS together (topbar.js beside topbar.css,
auth-manager beside login.css, etc.). Path-only moves; rewrote literals in
index.html, system-loader.js (confirmation/notifications/topbar/mobile-menu/
update-notifier/apps bundles), topbar.js's internal fetch('/core/topbar/
topbar.html'), and all THREE backup-app-card loaders (system-loader, backup/
index.js, spa.js). core/boot now = system-loader, system-orchestrator, auth/.
All 24 referenced paths resolve; full node --check sweep clean.

Signed-off-by: librelad <librelad@digitalangels.vip>

containers/libreportal/frontend/components/backup/index.js

@@ -31,7 +31,7 @@ LP.features.register({
     '/components/backup/configuration/js/backup-configuration.js',
     '/components/backup/configuration/js/backup-retention-presets.js',
     '/components/backup/configuration/js/backup-engine-details.js',
-    '/core/ui/backup-app-card.js',
+    '/core/backup-card/backup-app-card.js',
   ],
 
   async mount(ctx) {

containers/libreportal/frontend/core/boot/system-loader.js

@@ -69,9 +69,9 @@ class SystemLoader {
       global: null,
       dependencies: [],
       scripts: [
-        '/core/ui/topbar.js',
+        '/core/topbar/topbar.js',
-        '/core/ui/update-notifier.js',
+        '/core/update-notifier/update-notifier.js',
-        '/core/ui/mobile-menu.js'
+        '/core/topbar/mobile-menu.js'
       ]
     });
     
@@ -89,7 +89,7 @@ class SystemLoader {
       },
       global: null,
       dependencies: [],
-      script: '/core/ui/confirmation-dialog.js'
+      script: '/core/overlays/confirmation-dialog.js'
     });
 
     // Notifications
@@ -106,7 +106,7 @@ class SystemLoader {
       },
       global: 'notificationSystem',
       dependencies: [],
-      script: '/core/ui/notifications.js'
+      script: '/core/notifications/notifications.js'
     });
     
     // Dashboard
@@ -209,7 +209,7 @@ class SystemLoader {
       scripts: [
         '/components/apps/port-manager/js/port-manager.js',
         '/core/tasks/task-manager.js',  // Add TaskManager for backup functionality
-        '/core/ui/backup-app-card.js',
+        '/core/backup-card/backup-app-card.js',
         '/components/apps/services/js/services-manager.js',
         '/components/apps/tools/js/tools-manager.js',
         '/components/apps/routing/js/routing-manager.js',

containers/libreportal/frontend/core/kernel/spa.js

@@ -369,7 +369,7 @@ class LibrePortalSPAClean {
       // loadScript is idempotent — subsequent /backup navigations are no-ops.
       await Promise.all([
         this.loadScript('/components/backup/core/js/backup-page.js'),
-        this.loadScript('/core/ui/backup-app-card.js')
+        this.loadScript('/core/backup-card/backup-app-card.js')
       ]);
       const html = await this.fetchContent('/components/backup/core/html/backup-content.html');
       this.loadContent(html, 'Backups');

containers/libreportal/frontend/core/topbar/topbar.js

@@ -50,7 +50,7 @@ class TopbarComponent {
     // Load fresh topbar HTML
     try {
       //// // console.log('Loading topbar HTML (SPA mode)');
-      const response = await fetch('/core/ui/topbar.html');
+      const response = await fetch('/core/topbar/topbar.html');
       if (!response.ok) {
         throw new Error(`Failed to load topbar: ${response.status}`);
       }

containers/libreportal/frontend/index.html

@@ -67,8 +67,8 @@
     })();
   </script>
   <script src="/core/theme/theme-registry.js"></script>
-  <script src="/core/boot/controls/custom-select.js"></script>
+  <script src="/core/forms/controls/custom-select.js"></script>
-  <script src="/core/boot/controls/custom-number.js"></script>
+  <script src="/core/forms/controls/custom-number.js"></script>
 </head>
 <body>
   <!-- Topbar Container -->
@@ -85,7 +85,7 @@
 
   <!-- Scripts -->
   <!-- Auth must load first — gates all other initialization -->
-  <script src="/core/boot/auth-manager.js"></script>
+  <script src="/core/boot/auth/auth-manager.js"></script>
   <!-- Essential Bootstrap -->
   <!-- LpUi runs first so body.lp-ui--advanced / lp-ui--dev are set
        before any page/component renders → no FOUC of advanced sections. -->
@@ -95,14 +95,14 @@
   <script src="/core/data-loader/data-loader.js"></script>
   <script src="/core/live/live-system.js"></script>
   <script src="/core/ui-state/dismissible.js"></script>
-  <script src="/core/ui/eo-modal.js"></script>
+  <script src="/core/overlays/eo-modal.js"></script>
   <script src="/core/tasks/task-refresh-coordinator.js"></script>
   <script src="/components/dashboard/js/dashboard.js"></script>
   <script src="/core/boot/system-loader.js"></script>
-  <script src="/core/boot/loading-ui.js"></script>
+  <script src="/core/loading/loading-ui.js"></script>
-  <script src="/core/boot/setup/setup-detector.js"></script>
+  <script src="/core/setup/setup-detector.js"></script>
-  <script src="/core/boot/setup/setup-wizard.js"></script>
+  <script src="/core/setup/setup-wizard.js"></script>
-  <script src="/core/boot/setup/setup-completion-watcher.js"></script>
+  <script src="/core/setup/setup-completion-watcher.js"></script>
   <script src="/core/boot/system-orchestrator.js"></script>
   <!-- Feature-module kernel. Currently passive: defines window.LP.features and
        loads the page manifest; spa.js consults it for routing. See