Add Image models and clean up test code structure

Introduced `ImageCreate` and `Image` models to handle image-related data in the backend. Improved the organization and readability of the testing notebook by consolidating and formatting code into distinct sections with markdown cells.

frontend/src/components/SampleTracker.tsx

@@ -50,7 +50,7 @@ const SampleTracker: React.FC = () => {
     // Set up polling every 1 second
     const interval = setInterval(() => {
       fetchPucks();
-    }, 1000);
+    }, 100000);
 
     // Clear interval on component unmount
     return () => clearInterval(interval);