feat: add notification microservices and transactional outbox

libs/contracts/src/index.ts

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+export * from './notifications.contract';

libs/contracts/src/notifications.contract.ts

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+export const NOTIFICATION_RMQ_QUEUE = 'oudelaa.notifications';
+export const NOTIFICATION_RMQ_DLQ = 'oudelaa.notifications.dlq';
+
+export const NOTIFICATION_RPC = {
+  list: 'notifications.list',
+  unreadCount: 'notifications.unread-count',
+  markRead: 'notifications.mark-read',
+  markAllRead: 'notifications.mark-all-read',
+} as const;
+
+export interface MessageContext {
+  correlationId: string;
+  requestId: string;
+}
+
+export interface NotificationListRequest {
+  recipientId: string;
+  query: Record<string, unknown>;
+}
+
+export interface NotificationUnreadCountRequest {
+  recipientId: string;
+  category?: string;
+}
+
+export interface NotificationMarkReadRequest {
+  recipientId: string;
+  notificationId: string;
+}
+
+export interface NotificationMarkAllReadRequest {
+  recipientId: string;
+}
+
+export interface NotificationRealtimeUpdate {
+  recipientId: string;
+  notification?: unknown;
+  unreadCount: number;
+  unreadCounts?: Record<string, number>;
+}
+
+export interface NotificationRpcResponse<T> {
+  result: T;
+  realtime?: NotificationRealtimeUpdate;
+}

libs/contracts/tsconfig.lib.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": { "declaration": true, "outDir": "../../dist/libs/contracts" },
+  "include": ["src/**/*.ts"]
+}