Added a generic interface for retrieving images. Where multiple images exist, it'll retrieve the least seen. If there are sufficient images to work with, it'll randomly pick from a subset of the least seen to make it less predictable what's going to show up.

KfChatDotNetBot/Models/DbModels/ImageDbModel.cs

@@ -0,0 +1,9 @@
+namespace KfChatDotNetBot.Models.DbModels;
+
+public class ImageDbModel
+{
+    public int Id { get; set; }
+    public required string Key { get; set; }
+    public required string Url { get; set; }
+    public required DateTimeOffset LastSeen { get; set; }
+}