refactor(agent-office): tarot 모듈 제거 (tarot-lab으로 cutover 완료)

- DELETE: app/tarot/ 디렉토리 (pipeline, prompt, schema 모듈)
- DELETE: app/routers/tarot.py (FastAPI 라우터)
- DELETE: 4개 tarot 테스트 파일 (test_tarot_*.py)
- MODIFY: app/main.py — tarot 라우터 import + register 제거
- MODIFY: app/models.py — 5개 Tarot* 클래스 제거
- MODIFY: app/config.py — 4개 TAROT_* 환경변수 제거
- MODIFY: app/db.py — 6개 tarot_readings CRUD 함수 제거

KEEP:
- tarot_readings CREATE TABLE 블록 (DB 호환성)
- CREATE INDEX ... tarot_readings 인덱스 2개
- scripts/migrate_tarot_to_lab.py (cutover 마이그레이션)
- tests/test_migrate_tarot.py (마이그레이션 테스트)

테스트: 88 pass (migrate_tarot tests 포함)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

agent-office/app/main.py

@@ -12,11 +12,9 @@ from .agents import init_agents, get_agent, get_all_agent_states, AGENT_REGISTRY
 from .scheduler import init_scheduler
 from . import telegram_bot
 from .routers import notify as notify_router
-from .routers import tarot as tarot_router
 
 app = FastAPI()
 app.include_router(notify_router.router)
-app.include_router(tarot_router.router)
 
 _cors_origins = CORS_ALLOW_ORIGINS.split(",")
 app.add_middleware(