Add user profile and avatar upload feature

web/backend/Domain/Domain.Entities/Entities/UserAvatar.cs

@@ -0,0 +1,20 @@
+namespace Domain.Entities;
+
+public sealed class UserAvatar
+{
+    // PK
+    public Guid UserAvatarId { get; set; }
+
+    // FK References
+    public Guid UserProfileId { get; set; }
+    public Guid PhotoId { get; set; }
+
+    // Attributes
+    public DateTime ValidFrom { get; set; }
+    public DateTime? ValidTo { get; set; }
+
+    // Navigation Field
+    public Photo? Photo { get; set; }
+    // Audit Fields
+    public byte[]? RowVersion { get; set; }
+}