local_backend now uploads each product's image file to cloud_backend
during the existing ~5 min menu sync, so the QR menu can show real
photos without needing a manually-set digital_image_url. Only
re-uploads images whose content hash changed since the last push
(Product.cloud_image_hash), to avoid re-sending unchanged binaries
every cycle.
Also adds a manual "sync now" trigger (POST /api/system/sync-menu) and
a matching button in Settings → Operation, for pushing menu/price/image
changes immediately instead of waiting for the next automatic cycle.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
bonamin
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