Major changes:
- Renamed module from OrderItemsCustom to AdminOrderColumns for clarity
- Added CSS to hide product thumbnails in order items view
- Updated all namespaces from Shopkeeper\OrderItemsCustom to Shopkeeper\AdminOrderColumns
- Updated composer package name to shopkeeper/module-admin-order-columns
- Bumped version to 1.1.0
- Added layout XML and CSS files for thumbnail removal
- Updated all documentation and installation instructions
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Co-Authored-By: Claude <noreply@anthropic.com>
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