refactor: Update item division handling in supplier and customer management pages

- Added loading of item division categories to enhance filtering capabilities in supplier and customer management pages.
- Updated filtering logic to dynamically use item division codes for improved item search results.
- Ensured consistent handling of division codes across multiple company pages.

These changes aim to improve the user experience and data management in supplier and customer processes across various companies.

frontend/app/(main)/COMPANY_10/purchase/supplier/page.tsx

@@ -195,6 +195,10 @@ export default function SupplierManagementPage() {
           if (res.data?.success) optMap[col] = flatten(res.data.data || []);
         } catch { /* skip */ }
       }
+      try {
+        const res = await apiClient.get(`/table-categories/item_info/division/values`);
+        if (res.data?.success) optMap["item_division"] = flatten(res.data.data || []);
+      } catch { /* skip */ }
       setCategoryOptions(optMap);
 
       const priceOpts: Record<string, { code: string; label: string }[]> = {};
@@ -820,11 +824,12 @@ export default function SupplierManagementPage() {
       const allItems = res.data?.data?.data || res.data?.data?.rows || [];
       setItemTotalCount(allItems.length);
       const existingItemIds = new Set(priceItems.map((p: any) => p.item_id || p.item_number));
-      const PURCHASE_CODES = ["s"]; // 구매관리 카테고리 코드
+      const purchaseCode = categoryOptions["item_division"]?.find((o) => o.label === "구매관리")?.code;
       setItemSearchResults(allItems.filter((item: any) => {
         if (existingItemIds.has(item.item_number) || existingItemIds.has(item.id)) return false;
-        const divCodes = (item.division || "").split(",").map((c: string) => c.trim());
-        return divCodes.some((code: string) => PURCHASE_CODES.includes(code));
+        if (!purchaseCode) return true;
+        const div = item.division || "";
+        return div.includes(purchaseCode);
       }));
     } catch { /* skip */ } finally { setItemSearchLoading(false); }
   };