feat: a public notes page per release, for clients

On the releases page, «Página pública» (owners and admins) opens a
secret link to a page with the release's notes, readable without an
account, also for private projects: the notes written, or the draft
from its finished tickets while there are none (without repeating the
title the page already shows). The link can be copied, renewed (the old
one stops working) or withdrawn. Stored in Mongo (`release_note_shares`).

API: shareReleaseNotes / unshareReleaseNotes / releaseNotesShare,
publicReleaseNotes(token); GET/PUT/DELETE /api/releases/{id}/public-notes,
GET /api/shared/release-notes/{token}. Web: /notes/:token.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/application/src/lib/sharing.service.ts

@@ -11,8 +11,16 @@ import {
   ShareDashboardCommand,
   UnshareDashboardCommand,
 } from './sharing/dashboard-shares';
+import { ReleaseNotesShare } from './ports/release-note-shares.repository';
+import {
+  GetPublicReleaseNotesQuery,
+  GetReleaseNotesShareQuery,
+  PublicReleaseNotes,
+  ShareReleaseNotesCommand,
+  UnshareReleaseNotesCommand,
+} from './sharing/release-notes-shares';
 
-/** The project's dashboard for clients, behind a secret link. */
+/** The project's dashboard and its releases' notes, behind secret links. */
 @Injectable()
 export class SharingService {
   constructor(
@@ -48,6 +56,38 @@ export class SharingService {
     );
   }
 
+  /** A release's public notes link, if any (owners and admins). */
+  releaseNotesShare(
+    viewerId: string,
+    releaseId: string,
+  ): Promise<ReleaseNotesShare | null> {
+    return this.queryBus.execute(
+      new GetReleaseNotesShareQuery(viewerId, releaseId),
+    );
+  }
+
+  /** Turns a release's public notes on; `renew` makes a new secret. */
+  shareReleaseNotes(
+    actorId: string,
+    releaseId: string,
+    renew = false,
+  ): Promise<ReleaseNotesShare> {
+    return this.commands.execute(
+      new ShareReleaseNotesCommand(actorId, releaseId, renew),
+    );
+  }
+
+  unshareReleaseNotes(actorId: string, releaseId: string): Promise<void> {
+    return this.commands.execute(
+      new UnshareReleaseNotesCommand(actorId, releaseId),
+    );
+  }
+
+  /** A release's notes for anyone with the link, or null. */
+  publicReleaseNotes(token: string): Promise<PublicReleaseNotes | null> {
+    return this.queryBus.execute(new GetPublicReleaseNotesQuery(token));
+  }
+
   /** What a link shows now, or null if no project has it. */
   shared(token: string): Promise<SharedDashboardReadModel | null> {
     return this.queryBus.execute(new GetSharedDashboardQuery(token));