Restore and abstract AI image handling

public/Default.asp

@@ -29,6 +29,10 @@
 	router.AddRoute "POST", "/comments",             "CommentsController", "Create"
 	router.AddRoute "POST", "/comments/{id}/delete", "CommentsController", "Delete"
 
+	' Image routes
+	router.AddRoute "GET",  "/ai-image",              "ImagesController", "Ai"
+	router.AddRoute "HEAD", "/ai-image",              "ImagesController", "Ai"
+
 	' Admin routes
 	router.AddRoute "GET",  "/admin",                           "AdminController", "Index"
 	router.AddRoute "GET",  "/admin/posts",                     "AdminController", "Posts"