- Create StripeService: webhook sync, signature verification, save secret to .env.local
- Create StripeWebhookController with signature verification (400 on invalid)
- Create stripe:sync command to auto-create webhook endpoint via Stripe API
- Webhook listens to all events (configurable later)
- Save webhook secret automatically to .env.local on creation
- Add stripeAccountId field to User entity for Stripe Connect + migration
- Tests: StripeServiceTest (5), StripeWebhookControllerTest (2), StripeSyncCommandTest (1), UserTest updated
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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