功能：新增业务接口与扫码组件

shierfeng-fastapi-frontend/src/utils/palletScan.js

@@ -0,0 +1,17 @@
+export function normalizeScanValue(value) {
+  const normalizedValue = String(value ?? '').trim()
+  if (!normalizedValue) {
+    throw new Error('二维码不能为空')
+  }
+
+  return normalizedValue
+}
+
+export function isDuplicateScan(value, lastValue, scannedAt, lastScannedAt, duplicateWindowMs) {
+  const elapsed = scannedAt - lastScannedAt
+  return value === lastValue && elapsed >= 0 && elapsed <= duplicateWindowMs
+}
+
+export function createIdempotencyKey() {
+  return globalThis.crypto.randomUUID()
+}