Add chunked uploads and raise storage rate to GHS 0.30/GB/month.

Large files upload in 5 MB chunks (hosting file manager pattern) for the
transfer UI and Ladill Mail S2S API, with no app-level file size cap when
TRANSFER_MAX_FILE_BYTES=0.

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

app/Http/Controllers/Qr/AfiaController.php

@@ -70,7 +70,7 @@ class AfiaController extends Controller
                 ->whereNotNull('expires_at')
                 ->whereBetween('expires_at', [now(), now()->addDays(7)])
                 ->count(),
-            'storage_price_per_gb_month_ghs' => number_format((float) config('transfer.price_per_gb_month', 0.15), 2),
+            'storage_price_per_gb_month_ghs' => number_format((float) config('transfer.price_per_gb_month', 0.30), 2),
         ];
 
         if ($account->public_id) {