📄️ Upload Audio File
This endpoint uploads a WAV audio file to cloud storage, with the option to include a configuration file (e.g., .txt or .json). The endpoint validates the file types and size, checks required request headers, and ensures that the upload date is not in the future. If a configuration file is provided, it is validated; if invalid, the default configuration is used instead. The uploaded file and configuration (if valid) are sent to cloud storage (Azure or Google, based on configuration).