Try the Xiaohongshu anonymous explore feed API

- `items` holds public note cards only: `note_id`, `note_url`, `xsec_token`, `type`, `title`, `cover_url`, `liked_count`, and a public `author` card. Description, comments, coordinates, and any account or private field are not part of the anonymous feed. - `note_url` is the value to forward: it already carries the note id and a short-lived `xsec_token`. The token expires, so call `/xiaohongshu/note` promptly and re-run this endpoint for a fresh card when it does. `xsec_token` is also returned separately for diagnostics, but `note_url` is the ready-to-call form. - `count` is the number of usable cards in this one response (typically 20 to 33). Cards missing a note id, token, or card body are dropped; if no usable card remains, the endpoint reports an upstream error instead of returning an empty success, so `count: 0` is not a normal result. - `channel_id` is the channel the upstream actually served; it may differ from the request when `channel_id` was omitted. - A login or risk-control gate served in place of page state (for example an HTTP 200 challenge page, a redirect to `/login`, HTTP 461, or HTTP 403/406/429) is reported as an upstream `503`, not as an empty feed. A redirect to `/404/sec_*` (error code `300031`) means the note token was stale or the note was removed and is reported as `404`.