List site broken links

Lists the broken-link and mixed-content findings stored for one site, as a JSON:API collection of type `site-broken-link-issues` with the usual `links` / `meta` pagination. Only findings still open are returned — resolved ones are excluded. Each entry carries `target_url`, `category` (`broken_link` / `mixed_content`), `severity` (`error` / `warning` / `info`), `http_status_code`, `is_internal`, `anchor_text`, `element_type`, `pages_count`, `last_checked_at`, `ignored_at`, `created_at` and `updated_at`. Path variable `site` is the exact site id (e.g. `12345`). Read only: launching a scan, exporting and bulk-ignoring stay dashboard-only. Sites of other organizations — and members without the broken-links read permission — answer 404; an unknown filter value (bad enum, non-integer status code) answers 422. A read-only token is enough. The MCP twin of this endpoint is the `sites-broken-links-index` tool.