feat: import and export tickets as CSV

Every ticket of a project can be downloaded as CSV, and a CSV exported
from TaskStream or from Jira can be imported: types, statuses, priorities
and people are matched by id or name, the rest falls back with a warning,
and parents are rebuilt. The settings page previews an import before it
creates anything.

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

libs/api/tracker/application/src/index.ts

@@ -13,6 +13,8 @@ export * from './lib/saved-filters.service';
 export * from './lib/sprints.service';
 export * from './lib/git.service';
 export * from './lib/webhooks.service';
+export * from './lib/transfer.service';
+export * from './lib/transfer/import-export';
 export * from './lib/webhooks/webhooks';
 export * from './lib/webhooks/webhook-events';
 export * from './lib/git/git';