phsl / new-api

Enable searching topup records by trade_no across both admin-wide and user-only views.

Frontend
- TopupHistoryModal.jsx:
  - Add search input with prefix icon (IconSearch) to filter by order number
  - Send `keyword` query param to backend; works with both endpoints:
    - Admin: GET /api/user/topup?p=1&page_size=10&keyword=...
    - User:  GET /api/user/topup/self?p=1&page_size=10&keyword=...
  - Keep endpoint auto-switching based on role (isAdmin)
  - Minor UI polish: outlined admin action button; keep Coins icon for amount

Backend
- model/topup.go:
  - Add SearchUserTopUps(userId, keyword, pageInfo)
  - Add SearchAllTopUps(keyword, pageInfo)
  - Both support pagination and `trade_no LIKE %keyword%` filtering (ordered by id desc)
- controller/topup.go:
  - GetUserTopUps / GetAllTopUps accept optional `keyword` and route to search functions when present

Routes
- No new endpoints; search is enabled via `keyword` on existing:
  - GET /api/user/topup
  - GET /api/user/topup/self

Affected files
- model/topup.go
- controller/topup.go
- web/src/components/topup/modals/TopupHistoryModal.jsx