Add invoice total comparison in the order detail modal. When an order
has been invoiced, shows whether the invoice total matches the order
total — green badge if OK, red badge with difference amount if not.
Backend: compute reconciliation (difference, match) from existing
invoice.total_cu_tva vs order_total in order_detail endpoint.
Frontend: reconciliation badge below invoice info in modal, hidden
when no invoice exists.
Cache-bust: shared.js?v=17
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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