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

..

ADMIN_PAYMENT_INTEGRATION_API.md

feat(frontend): pass locale to iframe embedded pages via lang parameter

2026-03-09 19:38:23 +08:00

PAYMENT_CN.md

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

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

PAYMENT.md

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

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