기능 추가 — 신고 상황종료 처리

- DB: reports 테이블에 closure_type, closure_note, closed_at, closed_by 컬럼 추가
- 백엔드: PATCH /reports/{id}/close 엔드포인트 (사유 4종: natural/remote_reset/false_alarm/other)
- 신고상세: 승인대기 상태에서 [상황종료] 버튼 추가, 인라인 패널에서 사유 선택
- 상황종료 후 상세 화면에 사유·메모·처리자·일시 표시
- 엑셀 AS신고목록에 상황종료 4개 컬럼 추가
- 신고목록 필터·지도 상태 목록에 closed 추가, CSS 뱃지 추가

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/routers/reports.py

@@ -45,6 +45,10 @@ def _fmt_report(r: models.Report, db: Session):
         "repair_id": repair_id,
         "mechanic_name": mechanic_name,
         "mechanic_company": mechanic_company,
+        "closure_type": r.closure_type,
+        "closure_note": r.closure_note,
+        "closed_at":    r.closed_at.isoformat() if r.closed_at else None,
+        "closed_by_name": r.closer.name if r.closer else None,
     }
 
 @router.post("")
@@ -321,6 +325,29 @@ def approve_report(report_id: int, db: Session = Depends(get_db), _=Depends(requ
     r.status = "pending"; db.commit()
     return {"ok": True}
 
+CLOSURE_TYPES = {"natural", "remote_reset", "false_alarm", "other"}
+
+@router.patch("/{report_id}/close")
+def close_report(
+    report_id: int,
+    closure_type: str = Form(...),
+    closure_note: str = Form(""),
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(require_admin)
+):
+    if closure_type not in CLOSURE_TYPES:
+        raise HTTPException(400, "유효하지 않은 상황종료 사유입니다.")
+    r = db.query(models.Report).filter_by(id=report_id).first()
+    if not r: raise HTTPException(404)
+    from datetime import datetime
+    r.status       = "closed"
+    r.closure_type = closure_type
+    r.closure_note = closure_note.strip() or None
+    r.closed_at    = datetime.now()
+    r.closed_by    = current_user.id
+    db.commit()
+    return {"ok": True}
+
 @router.patch("/{report_id}/status")
 def update_status(report_id: int, status: str = Form(...),
                   db: Session = Depends(get_db), _=Depends(require_admin)):