feat: Implement duplicate inbound registration check and enhance receiving page

- Added a check in the receiving controller to prevent duplicate inbound registrations based on the inbound number, ensuring idempotency.
- Updated the receiving page to maintain selected items across different inbound types, improving user experience.
- Enhanced the item mapping logic to utilize inventory unit codes, ensuring accurate data representation.
- Adjusted the layout to include a new column for inbound type in the receiving table, providing better visibility of item classifications.

backend-node/src/controllers/receivingController.ts

@@ -198,6 +198,17 @@ export async function create(req: AuthenticatedRequest, res: Response) {
 		}
 		const insertedDetails: any[] = [];
 
+		// 기존 디테일이 있으면 스킵 (멱등성 — 같은 inbound_number로 2번 호출 방지)
+		const existingDetails = await client.query(
+			`SELECT COUNT(*) AS cnt FROM inbound_detail WHERE company_code = $1 AND inbound_id = $2`,
+			[companyCode, inboundNumber]
+		);
+		if (parseInt(existingDetails.rows[0].cnt, 10) > 0) {
+			await client.query("COMMIT");
+			client.release();
+			return res.json({ success: true, data: [], message: "이미 등록된 입고입니다." });
+		}
+
 		// 2. 디테일 INSERT (inbound_detail) + 재고/발주 업데이트
 		for (let i = 0; i < items.length; i++) {
 			const item = items[i];