Hermann_Kitio 6671bac347 feat(billing): TD-13 webhook idempotency + Stripe Customer Portal + doc cleanup ... - Table stripe_webhook_events + helpers isEventProcessed/markEventProcessed - POST /stripe/customer-portal (auth + stripe_customer_id check) - ARCHITECTURE-backend.md: suppression POST /plans/upgrade (duplication doc) - TD-13 fermé dans TECH_DEBT-backend.md - Tests: 261 → 278 verts (+17)		2026-04-26 04:15:46 +03:00
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migrations	feat(billing): TD-13 webhook idempotency + Stripe Customer Portal + doc cleanup	2026-04-26 04:15:46 +03:00