feat: expand API endpoints — user account management, referral stats, payment flow refactor, admin referrals
- Users: add connections, unlink, change-password, delete-account endpoints
- Referrals: add GET /stats endpoint with tier reward calculation
- Payments: refactor initializeIyzico/createEft to accept planKey+billingPeriod+brandIds
instead of subscriptionId, auto-create subscription during payment flow
- Admin: add getReferrals endpoint with search/pagination, fix inArray import
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
f5d1ed9bc3