feat(client): show actionable customs count on sidebar

src/modules/first-leg/api/customs.ts

@@ -283,3 +283,11 @@ export function merchantCustomsErrorMessage(error: unknown, fallback: string) {
 export function isMerchantCustomsUnavailable(error: unknown) {
   return error instanceof ApiError && (error.status === 404 || error.code === 'A0404')
 }
+
+
+export async function getMerchantCustomsPendingCount() {
+  const result = await apiRequest<{ pendingCount: string | number }>({ method: 'GET', url: '/merchant/v1/customs/pending-summary' })
+  const count = Number(result.pendingCount)
+  if (result.pendingCount == null || result.pendingCount === '' || !Number.isSafeInteger(count) || count < 0) throw new Error('报关待办数量返回不完整')
+  return count
+}