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,

file/src/test/java/com/baiyue/file/service/QualificationPackageServiceTest.java

@@ -83,6 +83,25 @@ class QualificationPackageServiceTest {
         verify(fixture.storage, never()).store(TENANT_ID, fixture.legalPersonId);
     }
 
+    @Test
+    void missingMultipartOriginalNamesUseStoredNamesForIamRegistration() {
+        var fixture = fixture();
+        var businessLicense = new MockMultipartFile("businessLicense", "", "image/png", new byte[] {1});
+        var legalPersonId = new MockMultipartFile("legalPersonId", "", "image/png", new byte[] {2});
+        when(fixture.storage.store(TENANT_ID, businessLicense)).thenReturn(fixture.businessStored);
+        when(fixture.storage.store(TENANT_ID, legalPersonId)).thenReturn(fixture.legalPersonStored);
+        when(fixture.iamClient.submitRequiredPackage(eq("internal-token"), any())).thenReturn(ApiResponse.success(
+                new IamQualificationClient.RequiredPackageResponse(31L, 32L, "PROFILE_REQUIRED", null, null)));
+
+        fixture.service.upload(TENANT_ID, businessLicense, legalPersonId,
+                "91310101abcde12345", null, null, false, false, false);
+
+        var captor = ArgumentCaptor.forClass(IamQualificationClient.RequiredPackageRequest.class);
+        verify(fixture.iamClient).submitRequiredPackage(eq("internal-token"), captor.capture());
+        assertEquals("business.pdf", captor.getValue().businessLicenseOriginalFileName());
+        assertEquals("legal-person.png", captor.getValue().legalPersonIdOriginalFileName());
+    }
+
     @Test
     void missingBusinessLicenseAndOrphanedLegalPersonParametersStillFailClosed() {
         var fixture = fixture();