Add ProductPrice.license_percent + license_min_amount and
ProductPrice::licenseFeePerPeriod() = max(percent% of unit_amount, minimum).
The shop amortizes it over the licence-term bracket (<=quarter / 6mo / 12mo),
so a monthly subscriber billed 3x in a quarter costs ONE quarterly fee — the
faithful reading of a per-unit, quarterly-accounted content licence.
subscriptionMetrics() now returns license_cost and net_mrr nets it out.
Additive: a null rule contributes 0. Covered by MrrMetricsTest; full suite green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Fabian @ Blax Software
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