refactor: backend→lotto 서비스 리네이밍 + lotto.db 레거시 테이블 스키마 제거

- backend/ → lotto/ 디렉토리 이동
- docker-compose: lotto-backend→lotto, lotto-frontend→frontend
- deploy scripts, nginx, agent-office config 네이밍 일괄 반영
- lotto/app/db.py에서 todos·blog_posts CREATE TABLE 제거 (personal로 이관 완료)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lotto/app/routers/briefing.py

@@ -0,0 +1,53 @@
+"""브리핑 저장/조회 + 큐레이터 사용량 엔드포인트."""
+from typing import Any, Dict, List
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel, Field
+from .. import db
+
+router = APIRouter(prefix="/api/lotto")
+
+
+class BriefingRequest(BaseModel):
+    draw_no: int
+    picks: List[Dict[str, Any]]
+    narrative: Dict[str, Any]
+    confidence: int = Field(ge=0, le=100)
+    model: str
+    tokens_input: int = 0
+    tokens_output: int = 0
+    cache_read: int = 0
+    cache_write: int = 0
+    latency_ms: int = 0
+    source: str = "auto"
+
+
+@router.post("/briefing", status_code=201)
+def save_briefing(body: BriefingRequest):
+    bid = db.save_briefing(body.model_dump())
+    return {"ok": True, "id": bid}
+
+
+@router.get("/briefing/latest")
+def latest():
+    b = db.get_latest_briefing()
+    if not b:
+        raise HTTPException(404, "no briefing yet")
+    return b
+
+
+@router.get("/briefing/{draw_no}")
+def get_one(draw_no: int):
+    b = db.get_briefing(draw_no)
+    if not b:
+        raise HTTPException(404, f"no briefing for draw {draw_no}")
+    return b
+
+
+@router.get("/briefing")
+def history(limit: int = 10):
+    return {"briefings": db.list_briefings(limit)}
+
+
+@router.get("/curator/usage")
+def usage(days: int = 30):
+    return db.get_curator_usage(days)