Behavior: Receives a base64-encoded image from a Blueforce device, uploads it to storage via the Blueforce unit of work, and returns the newly created asset identifier.

Authorization: Requires a valid Bearer token.

Side Effects: A new asset is created in the system from the uploaded image.

Error Scenarios: Returns 400 Bad Request if the image body is null or empty. Returns 401 Unauthorized if the caller is not authenticated.