feat: sprints with burndown and carry-over

Plan sprints with dates and a goal, run one at a time per project, and
put tickets in them from the ticket page. The Sprints tab follows the one
under way with its progress and a burndown in tickets or points against
the ideal line. Closing a sprint sends what was left to the next one or
back to the backlog; the board can be filtered by sprint.

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

libs/api/tracker/presenters/src/lib/http/projects.controller.ts

@@ -187,6 +187,7 @@ export class ProjectsController {
         labels: query.label,
         search: query.search,
         unassigned: query.unassigned,
+        sprintId: query.sprintId,
       },
       query.perColumn,
     );