Improve AI import UX and recognition quality

- AJAX upload with progress bar — browser no longer blocks during upload;
  redirects to status page immediately after file transfer completes
- Improved Ollama prompt: clearly separates manufacturer (brand logo),
  product name (descriptive text) and number (article code) to fix
  misidentification like treating the product name as manufacturer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Http/Controllers/NailPolishImportController.php

@@ -40,7 +40,13 @@ class NailPolishImportController extends Controller
 
         ProcessNailPolishImage::dispatch($import->id);
 
-        return redirect()->route('nail-polish-imports.show', $import)
+        $redirectUrl = route('nail-polish-imports.show', $import);
+
+        if (request()->ajax()) {
+            return response()->json(['redirect' => $redirectUrl]);
+        }
+
+        return redirect($redirectUrl)
             ->with('success', 'Bild hochgeladen! Die KI analysiert es jetzt im Hintergrund.');
     }