feat: unify alerts into one plugin, channels, rules and inbox

src/ui/plugin-host/app.ts

@@ -130,6 +130,8 @@ export function createPluginApp(
           hidden: item.hidden,
           after: item.after,
           order: item.order,
+          placement: item.placement,
+          useBadge: item.useBadge,
           pluginId,
           permission: item.permission
             ? resolvePluginPermission(pluginId, item.permission)

src/ui/plugin-host/sdk-ui.ts

@@ -150,16 +150,6 @@ export {
   type VersionInfo,
 } from "@/api/system-status-api";
 
-// Notification channels are core (ctx.notify on the backend). A plugin that
-// lets users pick or manage them shows core's own dialog.
-export { NotificationChannelDialog } from "@/sidebar/NotificationChannelDialog";
-export {
-  getNotificationChannels,
-  deleteNotificationChannel,
-  testNotificationChannel,
-  type NotificationChannel,
-} from "@/api/notification-channels-api";
-
 // Keyboard hints, the connection log panel and a named console logger.
 export { Kbd, KbdKey, KbdSeparator } from "@/components/kbd";
 export { ConnectionLogPanel } from "@/components/connection/ConnectionLogPanel";