_api_record_usage now resolves the target subscription via the source
app's own id (x_fc_nexacloud_subscription_id, scoped to the service)
before falling back to a direct Odoo sale.order id. This is what lets
NexaCloud push usage against the shadow subscriptions the importer
created from NexaCloud UUIDs — closing the flip-day mapping gap the
review flagged. Authz unchanged (partner must be linked to the service).
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