feat: add prettier for code formatting

refactor: update route for downloader to apps/downloader

chore: remove unused filler model files

refactor: delete Default layout component and its imports

frontend/src/App.tsx

@@ -22,8 +22,9 @@ export default function App() {
             <Route path="portfolio" element={<PortfolioPage />} />
             <Route path="contact" element={<ContactPage />} />
 
-            {/* Utilities */}
-            <Route path="downloader" element={<Downloader />} />
+            {/* APPS */}
+            <Route path="apps/downloader" element={<Downloader />} />
+            
           </Route>
 
           {/* Example protected route group (kept for future use) */}