refactor: migrate legacy API routes to /legacy prefix for backward compatibility

src/controller/comm/order_controller.go

@@ -7,12 +7,19 @@ import (
 	"github.com/labstack/echo/v4"
 )
 
-// CreateTransaction 创建交易
-func (c *BaseCommController) CreateTransaction(ctx echo.Context) (err error) {
+// LegecyCreateTransaction 创建交易
+func (c *BaseCommController) LegecyCreateTransaction(ctx echo.Context) (err error) {
 	req := new(request.CreateTransactionRequest)
 	if err = ctx.Bind(req); err != nil {
 		return c.FailJson(ctx, constant.ParamsMarshalErr)
 	}
+	// 兼容旧版本插件：如果未传递 token 和 currency，使用默认值
+	if req.Token == "" {
+		req.Token = "usdt"
+	}
+	if req.Currency == "" {
+		req.Currency = "cny"
+	}
 	if err = c.ValidateStruct(ctx, req); err != nil {
 		return c.FailJson(ctx, err)
 	}

src/controller/comm/pay_controller.go

@@ -1,17 +1,18 @@
 package comm
 
 import (
+	"html/template"
+	"net/http"
+	"path/filepath"
+
 	"github.com/assimon/luuu/config"
 	"github.com/assimon/luuu/model/response"
 	"github.com/assimon/luuu/model/service"
 	"github.com/labstack/echo/v4"
-	"html/template"
-	"net/http"
-	"path/filepath"
 )
 
-// CheckoutCounter 收银台
-func (c *BaseCommController) CheckoutCounter(ctx echo.Context) (err error) {
+// LegecyCheckoutCounter 收银台
+func (c *BaseCommController) LegecyCheckoutCounter(ctx echo.Context) (err error) {
 	tradeId := ctx.Param("trade_id")
 	resp, err := service.GetCheckoutCounterByTradeId(tradeId)
 	if err != nil {
@@ -21,11 +22,12 @@ func (c *BaseCommController) CheckoutCounter(ctx echo.Context) (err error) {
 	if err != nil {
 		return ctx.String(http.StatusOK, err.Error())
 	}
+	resp.Token = resp.ReceiveAddress // only for legacy checkout counter, token is the receive address
 	return tmpl.Execute(ctx.Response(), resp)
 }
 
-// CheckStatus 支付状态检测
-func (c *BaseCommController) CheckStatus(ctx echo.Context) (err error) {
+// LegecyCheckStatus 支付状态检测
+func (c *BaseCommController) LegecyCheckStatus(ctx echo.Context) (err error) {
 	tradeId := ctx.Param("trade_id")
 	order, err := service.GetOrderInfoByTradeId(tradeId)
 	if err != nil {