feat: Add Nostr chat integration for LNBits users

- Introduce a new chat system that allows LNBits users to communicate via Nostr relays.
- Implement ChatComponent for real-time messaging, peer selection, and message display.
- Create useNostrChat composable to manage Nostr relay connections, message encryption, and user authentication.
- Develop ChatPage to serve as the main interface for the chat feature.
- Add API endpoints for retrieving current user and public keys for peer messaging.
- Ensure secure communication with encryption and admin-only access to private keys.

src/router/index.ts

@@ -49,6 +49,15 @@ const router = createRouter({
         requiresAuth: true
       }
     },
+    {
+      path: '/chat',
+      name: 'chat',
+      component: () => import('@/pages/ChatPage.vue'),
+      meta: {
+        title: 'Nostr Chat',
+        requiresAuth: true
+      }
+    },
 
   ]
 })