feat(cupang): 쿠팡 밀크런 모듈 추가 (출고 달력/박스계산/입고센터)

- app/modules/cupang: router/db/store/itemcode + 템플릿 5종
- cupang_db 전용(JSON 폴백 없음). CUPANG_DB_URL 미설정 시 안내 페이지
- 월간 달력 + 출고 묶음(헤더+라인), 박스 입수량 자동계산(서버 재계산)
- 입고센터 관리(사용중 soft delete), 박스규칙 upsert, 엑셀 내보내기
- 상품 검색은 itemcode_db 읽기 전용(미설정 시 수동 입력)
- MODULE_KEYS/메뉴/아이콘/라벨 동기화, scripts/sql/cupang_db_init.sql(멱등)
- app/data/ gitignore 추가(PII)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/static/cupang.css

@@ -0,0 +1,111 @@
+/* 쿠팡 밀크런 — DESIGN.md 토큰 준수 (흰 배경 / 검정·회색 / 10·14px radius / 카드 16px) */
+
+.cpg { display: flex; flex-direction: column; gap: 16px; }
+.cpg-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
+
+/* ── 레이아웃: 왼쪽 큰 달력 + 오른쪽 리스트 ── */
+.cpg-layout {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 320px;
+  gap: 16px;
+  align-items: start;
+}
+@media (max-width: 980px) { .cpg-layout { grid-template-columns: 1fr; } }
+
+.cpg-cal-card, .cpg-list-card { padding: 16px; }
+
+.cpg-cal-head {
+  display: flex; align-items: center; justify-content: space-between;
+  margin-bottom: 12px;
+}
+.cpg-cal-title { font-size: 18px; font-weight: 600; letter-spacing: -0.45px; margin: 0; }
+.cpg-nav-btn { min-width: 36px; padding: 4px 10px; font-size: 16px; line-height: 1; }
+
+.cpg-cal-grid {
+  display: grid;
+  grid-template-columns: repeat(7, 1fr);
+  gap: 6px;
+}
+.cpg-cal-wd {
+  text-align: center; font-size: 12px; font-weight: 600;
+  color: var(--color-midtone-gray); padding: 4px 0;
+}
+.cpg-sun { color: var(--color-callout-red); }
+.cpg-sat { color: #2b5bc2; }
+
+.cpg-cal-cell {
+  display: flex; flex-direction: column; gap: 4px;
+  min-height: 84px; padding: 6px;
+  border: 1px solid var(--color-subtle-ash);
+  border-radius: 10px;
+  background: #fff;
+  transition: border-color .12s, box-shadow .12s;
+}
+.cpg-cal-cell:hover { border-color: var(--color-midtone-gray); }
+.cpg-out { background: var(--color-ghost-gray); color: var(--color-midtone-gray); }
+.cpg-today { border-color: var(--color-deep-black); }
+.cpg-selected { box-shadow: 0 0 0 2px var(--color-deep-black); border-color: var(--color-deep-black); }
+.cpg-cal-day { font-size: 13px; font-weight: 600; }
+.cpg-cal-badges { display: flex; flex-direction: column; gap: 3px; }
+.cpg-mini { font-size: 11px; padding: 1px 6px; align-self: flex-start; }
+
+/* ── 오른쪽 리스트 ── */
+.cpg-list-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 8px; }
+.cpg-list-head h2 { font-size: 16px; font-weight: 600; margin: 0; }
+.cpg-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
+.cpg-list-item { border: 1px solid var(--color-subtle-ash); border-radius: 10px; }
+.cpg-list-link { display: block; padding: 10px 12px; }
+.cpg-list-link:hover { background: var(--color-ghost-gray); border-radius: 10px; }
+.cpg-list-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
+.cpg-list-meta { font-size: 12px; margin-top: 4px; }
+.cpg-empty { padding: 16px 0; }
+
+/* ── 폼 ── */
+.cpg-form-card { padding: 16px; margin-bottom: 16px; }
+.cpg-card-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
+.cpg-card-head h2 { font-size: 16px; font-weight: 600; margin: 0; }
+
+.cpg-header-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+  gap: 12px;
+}
+.cpg-rule-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
+  gap: 12px; align-items: end;
+}
+.erp-field { display: flex; flex-direction: column; gap: 4px; }
+.erp-field > span { font-size: 12px; color: var(--color-midtone-gray); }
+.cpg-full { grid-column: 1 / -1; }
+
+.cpg-inline-form { display: inline-flex; gap: 6px; align-items: center; margin: 0; }
+.cpg-row-actions { display: flex; gap: 6px; flex-wrap: wrap; }
+
+/* ── 라인 테이블 ── */
+.cpg-lines td { vertical-align: middle; }
+.cpg-lines input { width: 100%; }
+.cpg-line-calc { font-size: 12px; color: var(--color-midtone-gray); white-space: nowrap; }
+.cpg-line-calc.cpg-warn { color: var(--color-callout-red); }
+.cpg-line-del { cursor: pointer; }
+
+/* ── 상세 ── */
+.cpg-detail-grid {
+  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+  gap: 12px; margin: 0;
+}
+.cpg-detail-grid dt { font-size: 12px; color: var(--color-midtone-gray); }
+.cpg-detail-grid dd { margin: 2px 0 0; font-size: 14px; }
+
+/* ── 상품 검색 드롭다운 ── */
+.cpg-search-pop {
+  position: absolute; z-index: 50;
+  background: #fff; border: 1px solid var(--color-subtle-ash);
+  border-radius: 10px; box-shadow: 0 4px 16px rgba(0,0,0,.08);
+  max-height: 260px; overflow-y: auto; min-width: 280px;
+}
+.cpg-search-item { padding: 8px 12px; cursor: pointer; font-size: 13px; }
+.cpg-search-item:hover, .cpg-search-item.is-active { background: var(--color-ghost-gray); }
+.cpg-search-item .cpg-sc { font-weight: 600; }
+.cpg-search-item .cpg-sn { color: var(--color-midtone-gray); margin-left: 8px; }
+.cpg-search-empty { padding: 10px 12px; font-size: 12px; color: var(--color-midtone-gray); }