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/ResultGrid.tsx

@@ -75,7 +75,6 @@ const ResultGrid: React.FC<ResultGridProps> = ({ activePgroup }) => {
                 const primaryImage = imageList[0];
                 // Define the base path to your backend images directory
 
-                const basePath = "https://localhost:8000/";
                 const imageUrl = basePath + primaryImage.filepath;
 
                 console.log("Local relative path:", imageUrl);