feat(cupang): 센터 중복 등록 알림 + 목록 지역별 그룹화

추가 시 같은 이름이 있으면 조용히 재활성되던 동작(ON CONFLICT DO UPDATE)
때문에 사용자가 중복을 알 수 없었다. 등록 전에 먼저 조회해서 이미 있으면
만들지 않고 알림(활성/비활성 구분)을 띄운다.

목록은 29개가 가로 4열로 흩어져 훑기 어려웠다. 센터명 앞 지역 접두사로
묶고(인천14 → "인천") CSS 멀티컬럼으로 한 열을 위→아래로 읽게 바꿨다.
숫자는 자연 정렬(인천4 < 인천14). 행 액션은 hover/focus 시에만 노출해
이름이 먼저 눈에 들어오게 했다.

- 라우터: _center_group / _center_sort_key / _group_centers 추가
- 검색은 그룹 단위로 접히고 결과 0건이면 안내 표시

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/modules/cupang/router.py

@@ -11,8 +11,10 @@ from __future__ import annotations
 
 import calendar as _calendar
 import json
+import re
 from fractions import Fraction
 from typing import Any
+from urllib.parse import quote
 
 from app.timezone import today_kst
 
@@ -408,6 +410,34 @@ async def hard_delete(
 # ════════════════════════════════════════════════════════════
 # 입고센터 관리
 # ════════════════════════════════════════════════════════════
+_CENTER_PREFIX_RE = re.compile(r"^\D*")
+
+
+def _center_group(name: str) -> str:
+    """센터명 앞부분(숫자 전까지)을 지역 그룹 키로 쓴다. 예) 인천14 → 인천."""
+    name = (name or "").strip()
+    prefix = _CENTER_PREFIX_RE.match(name).group(0).strip()
+    return prefix or name or "기타"
+
+
+def _center_sort_key(name: str) -> list[Any]:
+    """숫자를 숫자로 비교하는 자연 정렬. 예) 인천4 < 인천14."""
+    parts = re.split(r"(\d+)", (name or "").strip())
+    return [(1, int(p), "") if p.isdigit() else (0, 0, p.lower()) for p in parts]
+
+
+def _group_centers(centers: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    buckets: dict[str, list[dict[str, Any]]] = {}
+    for c in centers:
+        buckets.setdefault(_center_group(c["name"]), []).append(c)
+    groups = []
+    for key, items in buckets.items():
+        items.sort(key=lambda c: _center_sort_key(c["name"]))
+        groups.append({"name": key, "items": items, "count": len(items)})
+    groups.sort(key=lambda g: _center_sort_key(g["name"]))
+    return groups
+
+
 @router.get("/centers", response_class=HTMLResponse)
 async def centers_page(request: Request) -> HTMLResponse:
     from app.main import build_erp_nav, render_template  # noqa: WPS433
@@ -417,7 +447,10 @@ async def centers_page(request: Request) -> HTMLResponse:
     if not isinstance(guard, tuple):
         return guard
     store, user = guard
-    centers = sorted(store.list_centers(include_inactive=True), key=lambda c: c["name"])
+    centers = sorted(
+        store.list_centers(include_inactive=True),
+        key=lambda c: _center_sort_key(c["name"]),
+    )
     return render_template(
         request,
         "cupang/centers.html",
@@ -428,6 +461,9 @@ async def centers_page(request: Request) -> HTMLResponse:
             "page_title": "쿠팡 밀크런 — 입고센터 관리",
             "page_subtitle": "센터명 등록 · 수정 · 활성/비활성 · 삭제.",
             "centers": centers,
+            "center_groups": _group_centers(centers),
+            "flash": request.query_params.get("msg", ""),
+            "flash_name": request.query_params.get("name", ""),
         },
     )
 
@@ -442,11 +478,32 @@ async def center_create(
     store = _store(request)
     if store is None:
         raise HTTPException(status_code=503, detail="cupang_db 미설정")
+    name = (name or "").strip()
+    if not name:
+        return RedirectResponse(url="/cupang/centers", status_code=303)
+
+    # 같은 이름이 이미 있으면 새로 만들지 않고 알림만 돌려준다.
+    existing = next(
+        (
+            c
+            for c in store.list_centers(include_inactive=True)
+            if (c.get("name") or "").strip().lower() == name.lower()
+        ),
+        None,
+    )
+    if existing is not None:
+        msg = "dup" if existing.get("active") else "dup_inactive"
+        return RedirectResponse(
+            url=f"/cupang/centers?msg={msg}&name={quote(name)}", status_code=303
+        )
+
     try:
         store.create_center(name=name, sort_order=sort_order)
     except ValueError as exc:
         raise HTTPException(status_code=400, detail=str(exc))
-    return RedirectResponse(url="/cupang/centers", status_code=303)
+    return RedirectResponse(
+        url=f"/cupang/centers?msg=added&name={quote(name)}", status_code=303
+    )
 
 
 @router.post("/centers/{center_id}/edit")

app/modules/cupang/templates/cupang/box_calc.html

@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">

app/modules/cupang/templates/cupang/box_rules.html

@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">

app/modules/cupang/templates/cupang/centers.html

@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">
@@ -24,47 +24,78 @@
 
     <div class="cpg-card-head cpg-center-head">
       <h2>센터 목록 <span class="erp-muted" id="cpgCenterCount">({{ centers|length }})</span></h2>
-      <span class="erp-muted">쓰지 않는 센터는 비활성 또는 삭제. 이름 변경은 지원하지 않음 — 새로 등록.</span>
+      <span class="erp-muted">지역별로 묶어 표시. 이름 변경은 지원하지 않음 — 삭제 후 새로 등록.</span>
     </div>
 
-    <!-- 목록: 여러 열로 한 화면에 -->
+    <!-- 목록: 지역 그룹 카드, 위→아래로 읽고 열로 흐름 -->
-    <div class="cpg-center-grid" id="cpgCenterGrid">
+    <div class="cpg-center-cols" id="cpgCenterGrid">
-      {% for c in centers %}
+      {% for g in center_groups %}
+      <div class="cpg-center-group" data-group="{{ g.name|lower }}">
+        <div class="cpg-center-gtitle">
+          <span class="cpg-center-gname">{{ g.name }}</span>
+          <span class="cpg-center-gcount">{{ g.count }}</span>
+        </div>
+        {% for c in g["items"] %}
         <div class="cpg-center-row {% if not c.active %}is-inactive{% endif %}" data-name="{{ c.name|lower }}">
           <span class="cpg-center-dot" title="{% if c.active %}활성{% else %}비활성{% endif %}"></span>
           <span class="cpg-center-name">{{ c.name }}</span>
+          <span class="cpg-center-acts">
             <form method="post" action="/cupang/centers/{{ c.id }}/edit" class="cpg-inline-form">
               <input type="hidden" name="active" value="{% if c.active %}0{% else %}1{% endif %}" />
-          <button type="submit" class="erp-btn erp-btn-outline cpg-btn-sm"
+              <button type="submit" class="cpg-icon-btn"
                       title="{% if c.active %}비활성으로 전환{% else %}활성으로 전환{% endif %}">{% if c.active %}비활성{% else %}활성{% endif %}</button>
             </form>
             <form method="post" action="/cupang/centers/{{ c.id }}/delete" class="cpg-inline-form"
                   onsubmit="return confirm('{{ c.name }} 센터를 삭제할까요?');">
-          <button type="submit" class="erp-btn erp-btn-danger cpg-btn-sm">삭제</button>
+              <button type="submit" class="cpg-icon-btn is-danger" title="삭제">삭제</button>
             </form>
+          </span>
         </div>
         {% endfor %}
       </div>
+      {% endfor %}
+    </div>
+
+    <p class="cpg-center-empty erp-muted" id="cpgCenterEmpty" hidden>검색 결과 없음</p>
 
   </div>
 </section>
 
 <script>
 (function () {
+  // 추가 결과 알림 (중복 등록 방지)
+  var flash = {{ flash|tojson }};
+  var fname = {{ flash_name|tojson }};
+  if (flash === 'dup') {
+    alert('"' + fname + '" 센터는 이미 등록되어 있습니다.');
+  } else if (flash === 'dup_inactive') {
+    alert('"' + fname + '" 센터는 이미 등록되어 있습니다. (현재 비활성 상태 — 목록에서 활성으로 전환하세요.)');
+  }
+  if (flash) {
+    history.replaceState(null, '', '/cupang/centers');
+  }
+
   var box = document.getElementById('cpgCenterSearch');
   var grid = document.getElementById('cpgCenterGrid');
   var count = document.getElementById('cpgCenterCount');
+  var empty = document.getElementById('cpgCenterEmpty');
   if (!box || !grid) return;
-  var rows = Array.prototype.slice.call(grid.querySelectorAll('.cpg-center-row'));
+  var groups = Array.prototype.slice.call(grid.querySelectorAll('.cpg-center-group'));
   box.addEventListener('input', function () {
     var q = box.value.trim().toLowerCase();
     var n = 0;
-    rows.forEach(function (r) {
+    groups.forEach(function (g) {
+      var shown = 0;
+      Array.prototype.forEach.call(g.querySelectorAll('.cpg-center-row'), function (r) {
         var hit = !q || (r.dataset.name || '').indexOf(q) !== -1;
         r.style.display = hit ? '' : 'none';
-      if (hit) n += 1;
+        if (hit) shown += 1;
+      });
+      g.style.display = shown ? '' : 'none';
+      n += shown;
     });
     if (count) count.textContent = '(' + n + ')';
+    if (empty) empty.hidden = n !== 0;
   });
 })();
 </script>

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

@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">

app/modules/cupang/templates/cupang/form.html

@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">

app/modules/cupang/templates/cupang/index.html

@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">

app/modules/cupang/templates/cupang/products.html

@@ -1,6 +1,6 @@
 {% extends "erp_base.html" %}
 
-{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831b" />{% endblock %}
+{% block head_extra %}<link rel="stylesheet" href="/static/cupang.css?v=20260831c" />{% endblock %}
 
 {% block content %}
 <section class="cpg">

app/static/cupang.css

@@ -169,7 +169,7 @@
 .cpg-inline-form { display: inline-flex; gap: 6px; align-items: center; margin: 0; }
 .cpg-row-actions { display: flex; gap: 6px; flex-wrap: wrap; }
 
-/* ── 입고센터 관리 (상단: 추가·검색 / 아래: 목록 그리드) ── */
+/* ── 입고센터 관리 (상단: 추가·검색 / 아래: 지역 그룹 목록) ── */
 .cpg-center-card { padding: 16px; }
 
 .cpg-center-bar {
@@ -180,33 +180,69 @@
 .cpg-center-addinput { flex: 1 1 auto; min-width: 0; }
 .cpg-center-search { flex: 0 1 240px; min-width: 0; }
 
-.cpg-center-head { margin: 12px 0 8px; }
+.cpg-center-head { margin: 12px 0 10px; }
 
-.cpg-center-grid {
+/* 멀티컬럼: 한 열을 위→아래로 읽고, 다 차면 다음 열로 */
-  display: grid;
+.cpg-center-cols {
-  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
+  columns: 4 220px;
-  gap: 6px;
+  column-gap: 20px;
-  max-height: 70vh; overflow-y: auto;
+}
-  padding-right: 4px;
+.cpg-center-group {
+  break-inside: avoid; page-break-inside: avoid;
+  margin: 0 0 16px;
+}
+.cpg-center-gtitle {
+  display: flex; align-items: center; gap: 6px;
+  padding: 0 4px 4px;
+  border-bottom: 2px solid var(--color-rich-black);
+  margin-bottom: 4px;
+}
+.cpg-center-gname { font-size: 13px; font-weight: 700; letter-spacing: .02em; }
+.cpg-center-gcount {
+  font-size: 11px; font-weight: 600; line-height: 1;
+  padding: 2px 6px; border-radius: 999px;
+  background: var(--color-subtle-ash); color: var(--color-midtone-gray);
 }
 
 .cpg-center-row {
-  display: flex; align-items: center; gap: 6px;
+  display: flex; align-items: center; gap: 7px;
-  margin: 0; padding: 7px 10px;
+  padding: 5px 4px;
-  border: 1px solid var(--color-subtle-ash); border-radius: 10px;
+  border-bottom: 1px solid var(--color-subtle-ash);
   min-width: 0;
 }
+.cpg-center-row:last-child { border-bottom: none; }
 .cpg-center-dot {
-  flex: 0 0 auto; width: 8px; height: 8px; border-radius: 50%;
+  flex: 0 0 auto; width: 7px; height: 7px; border-radius: 50%;
   background: var(--color-success-green, #10c22b);
 }
-.cpg-center-row.is-inactive { opacity: .55; }
+.cpg-center-row.is-inactive { opacity: .5; }
 .cpg-center-row.is-inactive .cpg-center-dot { background: var(--color-subtle-ash); }
 .cpg-center-name {
   flex: 1 1 auto; min-width: 0;
   font-size: 14px; font-weight: 500;
   overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
 }
+
+/* 행 액션: 평소엔 흐리게, hover/focus 시 또렷하게 */
+.cpg-center-acts {
+  display: inline-flex; gap: 2px; flex: 0 0 auto;
+  opacity: 0; transition: opacity .12s ease;
+}
+.cpg-center-row:hover .cpg-center-acts,
+.cpg-center-row:focus-within .cpg-center-acts { opacity: 1; }
+@media (hover: none) {
+  .cpg-center-acts { opacity: .7; }
+}
+.cpg-icon-btn {
+  border: 0; background: none; cursor: pointer;
+  font-size: 11px; line-height: 1; padding: 3px 5px; border-radius: 6px;
+  color: var(--color-midtone-gray);
+}
+.cpg-icon-btn:hover { background: var(--color-subtle-ash); color: var(--color-rich-black); }
+.cpg-icon-btn.is-danger:hover { background: var(--color-ghost-gray); color: var(--color-callout-red); }
+
+.cpg-center-empty { margin: 8px 0 0; }
+
 .cpg-btn-sm { padding: 3px 8px; font-size: 12px; flex: 0 0 auto; }
 
 /* ── 라인 테이블 ── */