Restructure the EasyPay recommendation block to present two options side
by side so users can pick by funding channel and settlement currency:
- Domestic / CNY — ZPay: official Alipay/WeChat API with 1.6% fee and
T+1 automatic settlement (existing recommendation, expanded with fee
and settlement details).
- International / USDT or USD — Kyren Topup (https://kyren.top): global
payment stack supporting WeChat Pay and Alipay with local-currency
checkout, USD settlement, and USDT/USD withdrawal. Fees: WeChat 2%,
Alipay 2.5%, withdrawal 0.1% ($40 min / $150 max). Fills the gap for
users who cannot use domestic Chinese channels or tolerate Stripe's
6%+ fees.
Both recommendations share a single disclaimer at the end. The Chinese
heading uses "易支付" while the English one keeps "EasyPay".
- Add docs/PAYMENT.md and docs/PAYMENT_CN.md with full payment setup guide
- Mark Sub2ApiPay as deprecated in ecosystem tables (payment is now built-in)
- Add built-in payment system to features list in all 3 READMEs
