Michael Chihlas 2f8ec3775e feat(billing): add BillingService.open_customer_portal + GET endpoint ...

Authed users can now request a Stripe-hosted Customer Portal URL for card
updates and cancellation via GET /api/v1/billing/portal-session. The path is
already in both _SUBSCRIPTION_GUARD_ALLOWLIST and _EMAIL_VERIFICATION_ALLOWLIST
so canceled or unverified-past-grace users can still update billing.

- Returns 503 with {"error": "stripe_not_configured"} when STRIPE_SECRET_KEY unset.
- Returns 400 with {"error": "no_stripe_customer"} when account has no
  stripe_customer_id (must complete checkout first).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-06 20:00:08 -04:00

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