feat: notification framework

server/lib/notifications/agents/agent.ts

@@ -0,0 +1,13 @@
+import { Notification } from '..';
+
+export interface NotificationPayload {
+  subject: string;
+  username?: string;
+  image?: string;
+  message?: string;
+}
+
+export interface NotificationAgent {
+  shouldSend(type: Notification): boolean;
+  send(type: Notification, payload: NotificationPayload): Promise<boolean>;
+}