Record actual Stripe payment costs for tegwick membership

Update payment_records to 8.99 EUR gross, 0.44 EUR fees, 8.55 EUR net
payout to binky-hedgehog. Link member tegwick in membership ledger and
add Stripe reference catalog.

projects/coulomb-pricing/observatory/load.py

@@ -109,6 +109,8 @@ def load_payment_records(data_dir: Path | None = None) -> list[PaymentRecord]:
             currency=item["currency"],
             source=item["source"],
             member_count=item.get("member_count", 0),
+            member_username=item.get("member_username"),
+            payout_account=item.get("payout_account"),
         )
         for item in items
     ]