fix(cupang): 헤더 입력 185px — erp.css min-width:240 오버라이드

진짜 원인: erp.css .erp-input{min-width:240px} 가 width:185 를 눌러 240 고정.
헤더 입력 규칙에 min-width:185px 추가로 해결. 캐시 버전 c 로 bump.

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

app/templates/erp_base.html

@@ -4,8 +4,8 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <title>{{ page_title or "ERP" }} — DBX Corporation</title>
-    <link rel="stylesheet" href="/static/erp.css?v=20260530b" />
-    <link rel="stylesheet" href="/static/erp-shell.css?v=20260530b" />
+    <link rel="stylesheet" href="/static/erp.css?v=20260530c" />
+    <link rel="stylesheet" href="/static/erp-shell.css?v=20260530c" />
     <link rel="stylesheet" href="/static/erp-attach-viewer.css" />
     {% block head_extra %}{% endblock %}
   </head>