feat: an ordered backlog

A Backlog tab lists the tickets still to start in the order the team will
take them; drag them, or use the arrows, to reorder. Moving a ticket only
rewrites that ticket's rank, read from the event store, and board columns
follow the same order.

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

libs/web/tracker/presenters/src/lib/tracker.routes.ts

@@ -38,6 +38,12 @@ export const trackerRoutes: Routes = [
         loadComponent: () =>
           import('./pages/issue.page').then((m) => m.IssuePage),
       },
+      {
+        path: 'backlog',
+        title: 'Backlog · TaskStream',
+        loadComponent: () =>
+          import('./pages/backlog.page').then((m) => m.BacklogPage),
+      },
       {
         path: 'epics',
         title: 'Épicas · TaskStream',