fix(money): zero-decimal currency handling (D7)

Stripe sends zero-decimal currencies (JPY/KRW/VND/...) already in the
major unit; the unconditional /100 recorded a JPY dues charge 100x
understated in the ledger + receipt. minorToMajor is now currency-aware
(shared ZERO_DECIMAL_CURRENCIES/isZeroDecimalCurrency in
notifications-logic); formatMoney renders no fractional part for those.
Never fires for USD; closes silent ledger corruption for such tenants.
Tests added; suite 526+.

app/api/stripe/webhook/[space]/route.ts

@@ -298,7 +298,7 @@ export async function POST(
         await enqueueDues('dues_renewed', {
           memberId,
           fallbackEmail: inv.customer_email ?? null,
-          amount: minorToMajor(inv.amount_paid),
+          amount: minorToMajor(inv.amount_paid, inv.currency),
           currency: (inv.currency ?? 'usd').toUpperCase(),
           periodEnd: invoiceLinePeriodEnd(inv),
           invoiceId: inv.id,
@@ -317,7 +317,7 @@ export async function POST(
         await enqueueDues('dues_payment_failed', {
           memberId,
           fallbackEmail: inv.customer_email ?? null,
-          amount: minorToMajor(inv.amount_due),
+          amount: minorToMajor(inv.amount_due, inv.currency),
           currency: (inv.currency ?? 'usd').toUpperCase(),
           invoiceId: inv.id,
         })