feat(momo): 모모유통 유통관리 ERP 1차 구축 (가입/품목/재고/발주/명세서/메일)

- DB: momo_* 테이블 12종 (users/items/makers/warehouses/stocks/stock_moves/orders/order_items/procurements/vendors/attachments/mail_logs) + 시드
- 인증: 랜딩(/) + 회원가입(/signup, bcrypt) + 로그인(MOMO/FITO 자동 분기) + /api/auth/mobile-login(JWT 토큰)
- 세션: 쿠키 + Authorization Bearer 동시 지원 (모바일 앱용)
- /m/* 레이아웃: 좌측 사이드바 + 헤더, 역할별 메뉴 분기
- USER 화면: 품목 검색(이미지/재고/단가) + 장바구니 + 발주 요청 + 본인 이력 + 대시보드
- ADMIN 화면: 품목/창고/재고/매입입고/발주승인/회원관리/월간 매출 통계 + 대시보드(14일 그래프, 재고 부족, 승인 대기)
- 발주 승인: 트랜잭션으로 재고 차감 + 거래명세표 HTML 메일 본문 + xlsx 첨부 발송 (nodemailer)
- 면세 자동 판정: 품목명 'M' 접두 시 is_tax_free=Y, 합계는 면세/과세 분리 집계
- 미들웨어: /, /signup, /api/auth/signup, /api/auth/mobile-login 공개
- 도구: scripts/migrate-momo.mjs (npm run migrate:momo), .env.momo.example
- 문서: docs/MOMO_DISTRIBUTION_SPEC.md, docs/proposal.html (고객용 HTML 제안서)
- 별도 RN 앱(d:/momo-mobile) 스캐폴드 작성 (Expo + EAS APK 빌드)

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

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