ui(cupang): 제품명 목록/드롭다운 정렬을 제품코드 오름차순으로

폼 제품명 드롭다운 + 설정 등록목록 모두 list_products 사용 → ORDER BY product_code ASC

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

app/modules/cupang/db.py

@@ -211,7 +211,7 @@ class CupangDBStore:
         with self._pool.connection() as conn:
             rows = conn.execute(
                 f"SELECT * FROM cupang_products {where} "
-                "ORDER BY active DESC, sort_order ASC, product_name ASC"
+                "ORDER BY product_code ASC"
             ).fetchall()
         return [self._product_serialize(r) for r in rows]