- Add explicit payerMemberId field to purchase ledger entries
- Add 'Paid by' selector in mini app purchase add/edit forms
- Default payer to current user when creating new purchases
- Allow admins to change who made existing purchases
- Update backend handlers to accept and persist payerMemberId
- Add i18n translations for 'Paid by' label (EN/RU)
All quality gates pass: build, typecheck, lint, format, test
Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
