Submit SEO recommendations

Submit one draft or public HTTPS page for asynchronous SEO and AI-search recommendations. The website's organization must have the seo_recommendations entitlement in Autumn, and the caller must have website content administration access. Missing entitlement returns 403; an unavailable entitlement check returns 500 without creating a job. Queued work is checked again before analysis. Reuse request_id with identical input for retries; changed input returns 409. A website may have 1,000 outstanding jobs, with up to four active analyses and 16 across all websites. The website submit ceiling is 120 requests/minute, subject to the organization-wide API budget (default 60 requests/minute shared by submissions, polling and other API calls). Honor Retry-After on 429. Pace submissions and reserve request budget for polling a bounded subset of jobs; do not poll an entire backlog every poll_after_seconds. Polling never starts another analysis.