erio c777fe5471 docs: add built-in payment configuration guide and update README ...

- 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

2026-04-11 21:10:55 +08:00

1.9 KiB

Raw Blame History

View Raw