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/modules/cupang/templates/cupang/detail.html

@@ -0,0 +1,81 @@
+{% extends "erp_base.html" %}
+
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css" />{% endblock %}
+
+{% block content %}
+<section class="cpg">
+
+  <div class="erp-page-actions cpg-actions">
+    <a class="erp-btn erp-btn-primary" href="/cupang/{{ shipment.id }}/edit">수정</a>
+    <a class="erp-btn erp-btn-outline" href="/cupang/{{ shipment.id }}/export">엑셀</a>
+    <a class="erp-btn erp-btn-outline" href="/cupang/?date={{ shipment.ship_date }}">달력으로</a>
+
+    <form method="post" action="/cupang/{{ shipment.id }}/status" class="cpg-inline-form">
+      <select class="erp-select" name="status">
+        {% for s in statuses %}
+        <option value="{{ s }}" {% if shipment.status == s %}selected{% endif %}>{{ s }}</option>
+        {% endfor %}
+      </select>
+      <button type="submit" class="erp-btn erp-btn-outline">상태 변경</button>
+    </form>
+
+    <form method="post" action="/cupang/{{ shipment.id }}/delete" class="cpg-inline-form"
+          onsubmit="return confirm('이 출고 묶음을 취소 처리합니다. 계속할까요?');">
+      <button type="submit" class="erp-btn erp-btn-danger">취소 처리</button>
+    </form>
+  </div>
+
+  <!-- 헤더 -->
+  <div class="erp-card cpg-form-card">
+    <div class="cpg-card-head">
+      <h2>출고 #{{ shipment.id }}
+        {% set badge = 'erp-badge-neutral' %}
+        {% if shipment.status == '출고완료' %}{% set badge = 'erp-badge-inverse' %}
+        {% elif shipment.status == '센터입고완료' %}{% set badge = 'erp-badge-success' %}
+        {% elif shipment.status == '취소' %}{% set badge = 'erp-badge-danger' %}{% endif %}
+        <span class="erp-badge {{ badge }}">{{ shipment.status }}</span>
+      </h2>
+    </div>
+    <dl class="cpg-detail-grid">
+      <div><dt>작성일</dt><dd>{{ shipment.document_date }}</dd></div>
+      <div><dt>출고일</dt><dd>{{ shipment.ship_date }}</dd></div>
+      <div><dt>센터입고일</dt><dd>{{ shipment.center_arrival_date }}</dd></div>
+      <div><dt>입고센터</dt><dd>{{ shipment.center_name_snapshot or '—' }}</dd></div>
+      <div><dt>출고방식</dt><dd>{{ shipment.ship_method }}</dd></div>
+      <div><dt>작업자</dt><dd>{{ shipment.worker or '—' }}</dd></div>
+      <div><dt>문서번호</dt><dd>{{ shipment.document_no or '—' }}</dd></div>
+      <div class="cpg-full"><dt>출고/박스 요약</dt><dd>{{ shipment.outbound_summary or '—' }}</dd></div>
+      <div class="cpg-full"><dt>메모</dt><dd>{{ shipment.memo or '—' }}</dd></div>
+    </dl>
+  </div>
+
+  <!-- 라인 -->
+  <div class="erp-card cpg-form-card">
+    <div class="cpg-card-head"><h2>품목 ({{ shipment.lines|length }})</h2></div>
+    <div class="erp-table-wrap">
+      <table class="erp-table">
+        <thead>
+          <tr><th>#</th><th>제품코드</th><th>제품명</th><th>수량</th>
+              <th>입수량</th><th>필요박스</th><th>잔량</th><th>수동보정</th><th>메모</th></tr>
+        </thead>
+        <tbody>
+          {% for ln in shipment.lines %}
+          <tr>
+            <td>{{ ln.line_no }}</td>
+            <td>{{ ln.product_code }}</td>
+            <td>{{ ln.product_name_snapshot }}</td>
+            <td>{{ ln.quantity }}</td>
+            <td>{{ ln.units_per_box if ln.units_per_box else '미설정' }}</td>
+            <td>{{ ln.calculated_boxes if ln.calculated_boxes is not none else '—' }}</td>
+            <td>{{ ln.remainder_units if ln.remainder_units is not none else '—' }}</td>
+            <td>{{ ln.manual_box_text or '—' }}</td>
+            <td>{{ ln.memo or '—' }}</td>
+          </tr>
+          {% endfor %}
+        </tbody>
+      </table>
+    </div>
+  </div>
+
+</section>
+{% endblock %}