Endpoint: POST /api/v1/s3/upload
Body: Form-data (key: file, value: file to upload)
Endpoint: GET /api/v1/s3/download/{fileName}
Response: File content as application/octet-stream.
Endpoint: GET /api/v1/s3/list
Response: List of file names in the bucket.
Endpoint: DELETE /api/v1/s3/delete/{fileName}
Response: Confirmation message.