feat: verify manual mark-paid payments

- add on-chain validation before manual mark-paid
- verify recipient address, token contract, amount, confirmations, and tx time
- reject duplicate transaction hashes and non on-chain orders
- add manual payment verification tests for EVM, TRON, and Solana
- change BSC network key to binance
- add display_name to supported_assets while keeping network unchanged

src/model/service/pay_service.go

@@ -1,23 +1,23 @@
 package service
 
 import (
-	"errors"
-
 	"github.com/GMWalletApp/epusdt/config"
 	"github.com/GMWalletApp/epusdt/model/data"
-	"github.com/GMWalletApp/epusdt/model/mdb"
 	"github.com/GMWalletApp/epusdt/model/response"
+	"github.com/GMWalletApp/epusdt/util/constant"
 )
 
-var ErrOrder = errors.New("不存在待支付订单或已过期")
+// ErrOrder is returned when checkout initialization cannot find the trade id.
+var ErrOrder = constant.OrderNotExists
 
-// GetCheckoutCounterByTradeId returns checkout info for a pending order.
+// GetCheckoutCounterByTradeId returns checkout initialization data for an existing order.
+// It does not decide the payment state; callers should use CheckStatus for that.
 func GetCheckoutCounterByTradeId(tradeId string) (*response.CheckoutCounterResponse, error) {
 	orderInfo, err := data.GetOrderInfoByTradeId(tradeId)
 	if err != nil {
 		return nil, err
 	}
-	if orderInfo.ID <= 0 || orderInfo.Status != mdb.StatusWaitPay {
+	if orderInfo.ID <= 0 {
 		return nil, ErrOrder
 	}