v2.64.2

Fixes

• Local repository creation via the admin API failed with SSH errors (#356). POST /api/v1/clients/{id}/repositories ran borg init over the repo's SSH path using the agent's SSH identity and a hardcoded port 22, so it failed on any install where the SSH port isn't 22 (including the docker-compose default of 2222). Repo init now runs directly on the local path via the root helper — same flow the web UI already used — and repo ownership is set so agent backups can acquire the repo lock. Thanks @Rhonstin for the detailed report.
• Scheduler: a hung run can no longer exhaust the database connection pool. Scheduler runs are now guarded by a lock file so only one instance runs at a time.