feat: add read receipt handling based on user preferences

- Integrated `UsersService` into `MessagesService` for retrieving user preferences.
- Updated `markAsRead` functionality to respect `showReadReceipts` preference.
- Enhanced real-time read receipt notifications via `EventsGateway`.
- Added `markAsRead` method to the frontend message service.

frontend/src/services/message.service.ts

@@ -55,4 +55,8 @@ export const MessageService = {
 		});
 		return data;
 	},
+
+	async markAsRead(conversationId: string): Promise<void> {
+		await api.patch(`/messages/conversations/${conversationId}/read`);
+	},
 };