Use short ladill.com/q links for transfer shares and emails.

Share URLs and API public_url values again use the platform domain so
ladill.com/q/* forwards to transfer.ladill.com like other Ladill apps.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Http/Controllers/Api/ChunkedUploadController.php

@@ -139,7 +139,7 @@ class ChunkedUploadController extends Controller
             'data' => [
                 'id' => $transfer->id,
                 'title' => $transfer->title,
-                'public_url' => $transfer->qrCode?->shareUrl(),
+                'public_url' => $transfer->qrCode?->publicUrl(),
                 'paid_until' => $transfer->paid_until?->toIso8601String(),
                 'expires_at' => $transfer->paid_until?->toIso8601String(),
                 'files' => $transfer->files->map(fn ($file) => [