Relaxes _check_order_link to a no-op (service bookings auto-create their SO;
in-shop/walk-in tasks may have none) and adds x_fc_is_service_repair on
sale.order. The 'Service Repair' crm.tag from the plan is intentionally
omitted: fusion_claims does not depend on crm and sale.order has no tag_ids;
the boolean flag is the repair-SO identity.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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