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/models.py

@@ -33,46 +33,3 @@ class ComposeCommand(BaseModel):
     style: Optional[str] = None
     model: Optional[str] = "V4"
     instrumental: Optional[bool] = False
-
-
-class TarotCardDraw(BaseModel):
-    position: str
-    card_id: str
-    reversed: bool = False
-
-
-class TarotInterpretRequest(BaseModel):
-    spread_type: Literal["one_card", "three_card"]
-    category: Optional[str] = None
-    question: Optional[str] = None
-    cards: List[TarotCardDraw]
-    cards_reference: str = Field(..., min_length=1)
-    context_meta: dict = Field(default_factory=dict)
-
-
-class TarotInterpretResponse(BaseModel):
-    interpretation_json: dict
-    model: str
-    tokens_in: int
-    tokens_out: int
-    cost_usd: float
-    latency_ms: int
-    reroll_count: int = 0
-
-
-class TarotSaveRequest(BaseModel):
-    spread_type: Literal["one_card", "three_card"]
-    category: Optional[str] = None
-    question: Optional[str] = None
-    cards: List[TarotCardDraw]
-    interpretation_json: dict
-    model: str
-    tokens_in: int
-    tokens_out: int
-    cost_usd: float
-    confidence: Optional[str] = None
-
-
-class TarotPatchRequest(BaseModel):
-    favorite: Optional[bool] = None
-    note: Optional[str] = None