fix(procurement): preserve correction drafts separately from pending commands

src/modules/overseas-business/procurementCorrectionDraft.ts

@@ -0,0 +1,16 @@
+export interface ProcurementCorrectionDraft {
+  feeId: string
+  targetOriginalAmount: string
+  reason: string
+  voucherFileId: string
+  orderVersion: number
+}
+
+export function readCorrectionDraft(raw: string | null): ProcurementCorrectionDraft | null {
+  if (!raw) return null
+  const value: unknown = JSON.parse(raw)
+  if (!value || typeof value !== 'object') throw new Error('费用更正草稿无法读取')
+  const draft = value as Record<string, unknown>
+  if (!['feeId', 'targetOriginalAmount', 'reason', 'voucherFileId'].every(key => typeof draft[key] === 'string') || !Number.isSafeInteger(draft.orderVersion)) throw new Error('费用更正草稿无法读取')
+  return { feeId: draft.feeId as string, targetOriginalAmount: draft.targetOriginalAmount as string, reason: draft.reason as string, voucherFileId: draft.voucherFileId as string, orderVersion: draft.orderVersion as number }
+}