Pivot from recompute-metered-billing to INGEST NexaCloud's real Stripe
invoices into Odoo account.move (posted + payment-reconciled + HST), driven
by the dual-run finding that 94% of NexaCloud revenue is Stripe service
invoices + add-ons + proration outside the per-deployment/CPU model. Full
accounting SoR, all history + ongoing, revenue split by service family,
draft-first rollout. Build/test on trial; reuses the read-only DSN + partner
mapping. Supersedes the metered direction for NexaCloud (engine kept inert).
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