Implement identity verification feature with image upload and token management

FoodsharingSiegen.Contracts/Entity/ProspectImage.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FoodsharingSiegen.Contracts.Entity
+{
+    /// <summary>
+    ///     Represents an uploaded image for a prospect's verification.
+    /// </summary>
+    public class ProspectImage
+    {
+        [Key]
+        public Guid Id { get; set; }
+
+        public Guid ProspectId { get; set; }
+
+        [ForeignKey("ProspectId")]
+        public Prospect? Prospect { get; set; }
+
+        [Required]
+        public byte[] ImageData { get; set; } = [];
+
+        [Required]
+        [MaxLength(100)]
+        public string ContentType { get; set; } = string.Empty;
+
+        public DateTime Created { get; set; }
+    }
+}