feat: guest role for clients and outsiders

A project member can be a GUEST. In a private project a guest only sees
the tickets they take part in (opened, assigned or followed): every other
ticket answers 404, also in my work, realtime changes, blockers and
linked tickets, and project-wide views (activity, statistics, dashboard,
releases, sprints, epics, trash) answer 403. Guests open tickets without
assigning or planning them, and comment, attach, follow and vote on their
own; they change nothing else. In a public project they see what anyone
does. The web gives them only Tablero, Lista and Miembros and loads none
of the project-wide data.

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

libs/api/tracker/application/src/lib/queries/can-view-project.query.ts

@@ -5,6 +5,8 @@ export class CanViewProjectQuery extends Query<boolean> {
     /** Null: anonymous (public projects only). */
     public readonly viewerId: string | null,
     public readonly projectId: string,
+    /** The whole project (activity, releases…), not only a guest's tickets. */
+    public readonly wholeProject = false,
   ) {
     super();
   }