sort gallery by new-old, move to -slim docker image

Dockerfile

@@ -1,5 +1,5 @@
 # Use an official Python image as a base
-FROM python:3.11
+FROM python:3.11-slim
 
 # Set the working directory in the container
 WORKDIR /app

ai_frame_image_server.py

@@ -42,6 +42,7 @@ def gallery() -> str:
         str: The rendered HTML template.
     """
     images = [f for f in os.listdir(image_folder) if f.lower().endswith(('png', 'jpg', 'jpeg', 'gif'))]
+    images = sorted(images, reverse=True)
     return render_template("gallery.html", images=images)