- Create 4 new tables: subscriptions, subscription_events, donations, tier_vehicle_selections
- Add StripeClient wrapper with createCustomer, createSubscription, cancelSubscription,
updatePaymentMethod, createPaymentIntent, constructWebhookEvent methods
- Implement SubscriptionsRepository with full CRUD and mapRow case conversion
- Add domain types for all subscription entities
- Install stripe npm package v20.2.0
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
