env() returns an empty string (not null) when a STRIPE_PRICE_*
var is set but blank, so the ?? fallback never fired and the
synthetic subscription was created with stripe_price = '' —
which then resolved back to free in Plan::resolveForUser.
Switch to ?: so empty strings also fall back to the synthetic
price_admin_{tier}_{cadence} id, and backfill the matching Plan
row's stripe_price_id_{cadence} when empty so resolution succeeds.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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