fix: notify the backoffice of new booking

apps/edr-freight-api/src/modules/bookings/booking-lifecycle-notifier.service.ts

@@ -253,6 +253,19 @@ export class BookingLifecycleNotifierService {
 
   // ── Staff-facing (backoffice inbox) ────────────────────────────────────────
 
+  /**
+   * A booking was created under a contract. Contract drawdowns never pass
+   * through submit, so this is the only point at which staff learn the booking
+   * exists — {@link submittedToStaff} covers the direct-booking flow instead.
+   */
+  createdToStaff(b: Booking): void {
+    this.inAppStaff(
+      b,
+      'New booking created',
+      `Booking ${this.ref(b)} was created under a contract and has entered the pipeline.`,
+    );
+  }
+
   /** Customer submitted a booking for review. */
   submittedToStaff(b: Booking): void {
     this.inAppStaff(