Zhihu Search API

Please help me write a data collection script with the EveryInfra Zhihu Search endpoint (zhihu/search).

Endpoint contract:
- Request: POST https://api.everyinfra.com/api/v1/social with the header Authorization: Bearer <API key>. Read the key from the EVERYINFRA_API_KEY environment variable and never hard-code it.
- In the request body, set platform to zhihu and action to search, and put the parameters inside params.
- Required parameters:
  - keyword: The content search term for the Zhihu search action. Do not pass content URLs, author handles, or profile links to this parameter.
- Optional parameters:
  - content_type: Filters the content type for the search action. Allowed values are all (default), answer, article, and video. This parameter narrows matching content and does not change the response schema. (allowed: all / answer / article / video)
  - sort: Orders search results. Allowed values are general (default), upvote_count_descending for most-upvoted, and time_descending for newest publish. (allowed: general / time_descending / upvote_count_descending)
  - limit: The most rows to return in this call, an integer from 1 to 100. The default applies when you leave it out, and a call can return fewer rows. Larger values return 422 before any charge. (default: 20)
- Returns a list of records. Main fields of each record: id, type, url, title, text, like_count, comment_count, collect_count, posted_at, cover_image_url (Cover image URL), author_id, author_name; 18 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=zhihu.
- Example request body:
{
  "platform": "zhihu",
  "action": "search",
  "params": {
    "keyword": "如何学习摄影"
  }
}
- Price: $0.56 per 1,000 requests; failed and empty results are not charged.
- For dozens or hundreds of targets, add "mode": "async" to the body: you get a job_id at once and poll GET https://api.everyinfra.com/api/v1/jobs/{job_id} for the result.
- On 422, fix the request using the suggested parameter names and allowed values in the error; on 429 or 503, wait for Retry-After and try again.

Before writing code, ask me which targets I need, how many, which fields, and what output format I want; then confirm the plan and the rough cost with me.