- Add shop messages API endpoints (/api/v1/shop/messages) - Add shop messages page routes (/shop/account/messages) - Add messages.html template for customer account - Add Messages card to account dashboard with unread badge - Customers can view/reply to vendor_customer conversations 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>