fix: complete first version issue remediation

api/src/files/files.service.spec.ts

@@ -49,6 +49,38 @@ describe('FilesService', () => {
     });
   });
 
+  it('restores UTF-8 filenames that multipart parsing exposed as Latin-1', async () => {
+    const prisma = {
+      fileObject: {
+        create: jest.fn().mockImplementation(({ data }) => Promise.resolve({ id: 'file-1', ...data })),
+      },
+    };
+    const objectStorage = {
+      getBucket: jest.fn().mockReturnValue('cmpp-platform'),
+      putObject: jest.fn().mockResolvedValue({ etag: 'etag-1' }),
+      presignedPutObject: jest.fn(),
+    };
+    const service = new FilesService(prisma as never, objectStorage as never);
+    const originalname = Buffer.from('营业执照.png', 'utf8').toString('latin1');
+
+    await service.upload({ purpose: 'enterprise_photo' }, {
+      originalname,
+      mimetype: 'image/png',
+      size: 12,
+      buffer: Buffer.from('file-content'),
+    });
+
+    expect(prisma.fileObject.create).toHaveBeenCalledWith({
+      data: expect.objectContaining({ fileName: '营业执照.png' }),
+    });
+    expect(objectStorage.putObject).toHaveBeenCalledWith(
+      expect.stringMatching(/营业执照\.png$/),
+      expect.any(Buffer),
+      12,
+      'image/png',
+    );
+  });
+
   it('downloads file content from object storage by FileObject id', async () => {
     const fileObject = {
       id: 'file-1',