文件下载名称调优

src/Jiaowu.Api/Controllers/OfficialDocumentsController.cs

@@ -4,6 +4,7 @@ using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
 using Jiaowu.Api.Infrastructure.OfficialDocuments;
+using Jiaowu.Api.Infrastructure.Files;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
@@ -220,7 +221,8 @@ public sealed class OfficialDocumentsController(
             UserAgent = Request.Headers.UserAgent.ToString()
         });
         await db.SaveChangesAsync(cancellationToken);
-        return File(document.PdfContent, "application/pdf", $"{document.DocumentNumber}.pdf");
+        return File(document.PdfContent, "application/pdf",
+            DownloadFileName.Document("公文", ".pdf", document.DocumentNumber));
     }
 
     [HttpGet("{id:guid}/downloads")]