Fix API proxy path - maintain /api/ prefix for backend calls

frontend/src/app/api/[...path]/route.ts

@@ -36,6 +36,7 @@ export async function DELETE(
 async function proxyToBackend(request: NextRequest, pathSegments: string[]) {
   const path = pathSegments.join('/');
   // Use dedicated backend subdomain for reliable API access
+  // The catch-all route strips '/api/' from the path, so we need to add it back
   const backendUrl = `https://files.mad-lawsuit.org/api/${path}`;
   
   // Get the search params from the original request