feat(FN-1116): add Capacitor plugin managers for dashboard

- Add shared plugin types and manager modules for splash screen, status bar, and network handling
- Export plugin initialization from the dashboard entrypoint and configure Capacitor splash/status-bar defaults
- Add unit tests covering plugin initialization and each manager's behavior across supported scenarios
- Document the plugin manager architecture and add required Capacitor plugin dependencies

packages/dashboard/src/index.ts

@@ -12,3 +12,5 @@ export {
   RedisBadgePubSub,
   createBadgePubSub,
 } from "./badge-pubsub.js";
+
+export * from "./plugins/index.js";