feat(notification): add Bark push support

Add Bark as a notification-service delivery channel, including encrypted Device Key configuration, server URL/template settings, module status integration, and admin UI support.

frontend/src/router/index.ts

@@ -294,6 +294,16 @@ const routes: RouteRecordRaw[] = [
         component: () => importWithRetry(() => import('@/views/admin/modules/ServerChanSettings.vue')),
         meta: { module: 'server_chan_push' }
       },
+      {
+        path: 'bark',
+        redirect: '/admin/modules/bark'
+      },
+      {
+        path: 'modules/bark',
+        name: 'BarkSettings',
+        component: () => importWithRetry(() => import('@/views/admin/modules/BarkSettings.vue')),
+        meta: { module: 'bark_push' }
+      },
       {
         path: 'email',
         name: 'EmailSettings',