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

@@ -45,7 +45,7 @@ const ResultGrid: React.FC<ResultGridProps> = ({ activePgroup }) => {
         console.log('Resolved OpenAPI.BASE:', OpenAPI.BASE);
 
         // Set the base path for images dynamically
-        setBasePath(`${OpenAPI.BASE}/images/`);
+        setBasePath(`${OpenAPI.BASE}/`);
     }, []);
 
     useEffect(() => {