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/issues.controller.ts

@@ -157,6 +157,8 @@ export class IssuesController {
       unassigned: query.unassigned,
       releaseId: query.releaseId,
       labels: query.label,
+      sprintId: query.sprintId,
+      noSprint: query.noSprint,
       sort: query.sort,
       search: query.search,
       limit: query.limit,