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/lib/commands/create-issue.command-handler.ts

@@ -49,6 +49,7 @@ export class CreateIssueCommandHandler
         title: command.title,
         reporterId: command.actorId,
         assigneeId: command.assigneeId,
+        status: command.initialStatus,
       },
       workflow,
     );

libs/api/tracker/application/src/lib/commands/create-issue.command.ts

@@ -14,6 +14,8 @@ export class CreateIssueCommand extends Command<CommandResult> {
     public readonly releaseId?: string | null,
     /** Epic or ticket the new one breaks down. */
     public readonly parentId?: string | null,
+    /** Imports only: start in this (active) status instead of the first one. */
+    public readonly initialStatus?: string | null,
   ) {
     super();
   }