feat: Implement Relay Hub Status page with connection and subscription testing features

- Add a new RelayHubStatus.vue component to monitor and test the centralized Nostr relay hub functionality.
- Include sections for Relay Hub Status, Subscription Details, Connection Test, Subscription Test, Mobile Visibility Test, and Configuration Info.
- Implement reactive state management for connection testing and subscription events, enhancing user interaction and visibility into relay hub operations.
- Update router configuration to route to the new RelayHubStatus component.

src/router/index.ts

@@ -61,7 +61,7 @@ const router = createRouter({
     {
       path: '/relay-hub-status',
       name: 'relay-hub-status',
-      component: () => import('@/pages/RelayHubDemo.vue'),
+      component: () => import('@/pages/RelayHubStatus.vue'),
       meta: {
         title: 'Relay Hub Status',
         requiresAuth: true