Add storefronts:import-legacy command

One-time importer that copies legacy menu/shop storefronts (and their
products, stored inline in qr_codes.payload.content.sections) from the
shared platform DB into this app's database, so owners who created them
before the Merchant extraction can see/manage them again.

- Maps platform owners to local users by public_id (SSO sub), creating a
  local user stub when missing
- Copies product images from a new read-only `platform_qr` disk
  (PLATFORM_QR_ROOT) to the local `qr` disk
- Idempotent (skips existing short_codes unless --refresh); supports
  --user, --dry-run, --skip-images

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

config/filesystems.php

@@ -67,6 +67,16 @@ return [
             'report' => false,
         ],
 
+        // Read-only view of the monolith's QR storage, used by the
+        // storefronts:import-legacy command to copy legacy product images.
+        // Set PLATFORM_QR_ROOT to the monolith's storage/app/private/qr path.
+        'platform_qr' => [
+            'driver' => 'local',
+            'root' => env('PLATFORM_QR_ROOT', storage_path('app/private/qr')),
+            'throw' => false,
+            'report' => false,
+        ],
+
     ],
 
     /*