- Add stripeChargesEnabled and stripePayoutsEnabled fields to User entity + migration
- Handle account.updated webhook: sync charges_enabled and payouts_enabled from Stripe
- Add createAccountConnect() and createAccountLink() to StripeService
- Update organizer approved email with Stripe verification notice
- Tests: webhook account.updated with flags, unknown account, User stripe fields
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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