Replay one parked job (re-enters the normal claim path)

Moves the parked row back into `jobs` with a fresh attempt budget; the normal worker loop (SKIP LOCKED, per-environment fairness, delete-on-completion) runs it. Never executed inline.

curl -X POST "https://example.com/admin/api/dlq/string/replay"

{
  "replayed": 0
}

{
  "error": {
    "code": "invalid_request",
    "message": "string"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "string"
  }
}