Hide the referral program from Wallet

[leoxk]

What changed

• remove the Referral Program card from the Wallet render tree
• remove the customer-facing referral-link copy action and reward-transfer dialog from Wallet
• keep existing affiliate fields, historical data, and backend endpoints unchanged for future restoration or audit

Why

Glimo AI Gateway is currently an approved-customer B2B product and has no plan to expose customer referrals. The B2B Wallet already substituted Refund & Support for this card, but the upstream non-B2B branch could make the program reappear after a future configuration change.

Safety

• no affiliate history or user data is deleted
• no balances, reward amounts, users, model pricing, routes, or payment settings are changed
• the Stripe top-up, redemption-code, refund-support, and order-history flows are unchanged

Validation

• git diff --check
• frontend typecheck/build and the full backend suite will run in Glimo B2B CI