feat(대무자): SubstituteService/Controller/mapper — CRUD + 검증 + Filter 핫패스
- substitute.xml (namespace=substitute): selectSubstituteList/Cnt, selectMySubstitutes,
selectActiveOriginalUserIds (Filter 핫패스), selectActiveProxyForLine (결재 어댑터),
countOverlap, countUserInCompany, countSuperAdmin, insert/update/delete
- SubstituteService extends BaseService: 관리자 권한 검증, self-위임 차단,
cross-company 검증, SUPER_ADMIN 을 proxy 로 지정 거부, 사전 겹침 검증
- SubstituteController: /api/substitutes CRUD + /mine (read-only) + /check-overlap
johngreen
6a7d261d23