feat(backend): AI 코스 생성에 Anthropic 클라이언트와 프롬프트 v1, 조건 해석 연결

4단계까지 서버는 가짜 AI 로 코스를 만들었다. 실제 모델(기본 Haiku 5.5)을 붙여
문장에서 조건을 읽고 후보 중 코스를 고르게 한다(설계 §14 5단계).

- 구조화 출력(JSON 스키마)으로 받고, 같은 시스템 프롬프트는 캐시에 올린다
- 조건 해석은 AI 가 값만 뽑고 기본값과 되물을 것은 코드가 정한다(unknown_place 추가)
- 조건 해석 비용과 응답 뒤 실패한 호출 비용도 하루 비용 상한에 넣는다
- AI_PROVIDER(fake 로 되돌림) · effort 설정, 모델은 가격표에 있어야 기동한다
- 키로 실제 호출을 확인하는 ai:check 명령

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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