WeChat/Alipay/Epay reject reusing the same merchant order number when
params change. Allocate attempt-suffixed out_trade_no on resume pay,
map callbacks back to the local order, and best-effort close prior trades.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Move 288 types from global AKSRT_* + inc/classes manual requires into
namespace AKSRT\{Domain} under src/AKSRT/, wire composer.json psr-4,
and slim bootstrap to helpers/modules/hooks only. Split multi-class
widget/gateway files, update admin contract audit paths, and document
the layout in ADR/README.