feat(client): 行政代提交/代上传 owner 选择入口(F33)

- 报销创建支持选择 ownerEmployeeId（delegation-grants received）
- 票据上传支持 owner_employee_id（delegation-grants received）
- 保持普通员工流程不变，权限不足由后端阻断

client/src/api/invoicePool.ts

@@ -96,12 +96,15 @@ export async function fetchInvoicePoolDetail(invoiceId: string) {
   return apiRequestData<InvoicePoolDetail>(`/api/invoice-pool/${invoiceId}`);
 }
 
-export async function uploadInvoice(file: File, ocrType?: string) {
+export async function uploadInvoice(file: File, ocrType?: string, ownerEmployeeId?: string) {
   const formData = new FormData();
   formData.append("file", file);
   if (ocrType) {
     formData.append("ocr_type", ocrType);
   }
+  if (ownerEmployeeId) {
+    formData.append("owner_employee_id", ownerEmployeeId);
+  }
 
   return apiRequestData<{ invoicePoolId: string; status: string; fileSha256: string }>(
     "/api/invoice-pool/upload",