Fix: Added a guard clause for invalid emails

[rbacordio]

This pull request addresses the issue on the Account controller specifically on the create account endpoint by introducing a guard clause to prevent creating accounts with invalid emails.

[JMark-FS]

You can use the [EmailAddress] Data annotation for the email property.

	[Required]
	[MaxLength(50)]
	[EmailAddress] // Add this line of code in the AccountCreateDto
	public string Email { get; set; }

[jaymar921]

Looks good to me, just implement what's JM suggested