Create a brief from a user-pasted text brief (Entry #2)

Inserts the brief in `queued` status and enqueues the parser pipeline asynchronously, returning the briefId in <100ms. The pipeline parses the raw text via Claude Sonnet (outline_extraction → enrichment), populates the brief document, and lands the brief in `brief_editing`. Skips the 14-step research pipeline and does NOT auto-start content generation — the caller (UI or agent) must walk the brief editor and trigger content generation through `POST /domains/:domainId/content-briefs/:briefId/content/generate`. The full CONTENT_GENERATION credit cost is checked there, but this endpoint also runs a pre-flight CONTENT_COST_MIN floor check so callers without the minimum content credits fail fast (mirrors the AI flow's BRIEF_GENERATION pre-flight) — that is what produces a 402 here. Subscribe to `subscribe_content_brief` socket events with the returned briefId to follow parser progress.

curl -X POST "https://example.com/domains/string/content-briefs/from-user-brief" \  -H "Content-Type: application/json" \  -d '{    "market": "us",    "language": "en",    "userBriefRawText": "H1: Internal Audit Explained\\nH2: What is an internal audit\\n..."  }'

{
  "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "keyword": "best running shoes",
  "market": "US",
  "language": "en",
  "targetArticleTitle": "How to choose running shoes",
  "status": "completed",
  "kanbanStatus": "briefs",
  "currentStep": 14,
  "totalSteps": 14,
  "currentStepName": "title_suggestions",
  "detectedArticleType": "guide",
  "createdAt": "2026-05-25T10:30:00.000Z",
  "completedAt": "2026-05-25T10:35:00.000Z",
  "errorMessage": "SERP provider returned no results",
  "autopilotMode": false,
  "fromContentGap": true
}