IAV-491 : integrate credit microservice with full subscription management (!108) · Requêtes de fusion · iavia / iavia-front · GitLab

saoud marouane a demandé de fusionner feature/IAV-491 vers develop déc. 29, 2025

Display user wallet with all balance types (main, extra, referral)
Display subscription plans with pricing and features
Implement first subscription flow via Stripe Checkout
Implement subscription change (upgrade/downgrade) with credit refund calculation
Implement extra credit purchase with one-time payment
Handle Stripe webhooks for payment confirmation and credit allocation

Closes IAV-491