Retrieves detailed information for a specific fraud case by its case ID.
This endpoint performs the following operations:

1. Validates the provided case ID to ensure it's not null or empty.
2. Retrieves the fraud case details from the repository.
3. Returns the case details in a structured response format.

If the case ID is not found, a 404 Not Found response is returned.
For validation errors, a 400 Bad Request response is returned.
For processing errors, a 422 Unprocessable Entity response is returned.
For unexpected errors, a 500 Internal Server Error response is returned.

The response includes comprehensive case information such as:

• Case identification details
• Associated transaction information
• Member and contact details
• Current case status and history
• Related case metadata