fix: preserve qualification file names across uploads

file/src/main/java/com/baiyue/file/service/QualificationPackageService.java

@@ -11,6 +11,7 @@ import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.time.LocalDate;
+import org.springframework.util.StringUtils;
 
 @Service
 public class QualificationPackageService {
@@ -45,9 +46,10 @@ public class QualificationPackageService {
         String legalPersonIdDocumentUrl = storedLegalPersonId == null ? null : storedLegalPersonId.documentUrl();
 
         var request = new IamQualificationClient.RequiredPackageRequest(
-                tenantId, normalizedCreditCode, storedBusinessLicense.documentUrl(), businessLicense.getOriginalFilename(),
+                tenantId, normalizedCreditCode, storedBusinessLicense.documentUrl(),
+                originalFileName(businessLicense, storedBusinessLicense, "business-license"),
                 businessLicenseValidTo, replaceBusinessLicense, legalPersonIdDocumentUrl,
-                legalPersonId == null ? null : legalPersonId.getOriginalFilename(),
+                legalPersonId == null ? null : originalFileName(legalPersonId, storedLegalPersonId, "legal-person-id"),
                 legalPersonIdValidTo, replaceLegalPersonId);
         try {
             var response = platform
@@ -87,6 +89,13 @@ public class QualificationPackageService {
         if (storedFile != null) storage.delete(storedFile);
     }
 
+    private String originalFileName(MultipartFile file, LocalQualificationStorage.StoredFile stored, String fallback) {
+        String original = file.getOriginalFilename();
+        if (StringUtils.hasText(original)) return original;
+        String storedName = stored == null ? null : stored.fileName();
+        return StringUtils.hasText(storedName) ? storedName : fallback;
+    }
+
     public record PackageUploadResult(Long businessLicenseQualificationId,
                                       Long legalPersonIdQualificationId,
                                       String tenantStatus,