fix: BepUsdt请求体amount改为float64数字类型，修复订单表格宽度

backend/internal/api/handlers/payment.go

@@ -25,6 +25,15 @@ func NewPaymentHandler() *PaymentHandler {
 	return &PaymentHandler{}
 }
 
+type BepUsdtCreateRequest struct {
+	TradeType   string  `json:"trade_type,omitempty"`
+	OrderID     string  `json:"order_id"`
+	Amount      float64 `json:"amount"`
+	NotifyURL   string  `json:"notify_url"`
+	RedirectURL string  `json:"redirect_url,omitempty"`
+	Signature   string  `json:"signature"`
+}
+
 func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 	userID := c.GetUint("user_id")
 	orderID, _ := strconv.Atoi(c.Param("id"))
@@ -78,12 +87,20 @@ func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 	}
 
 	signature := signBepUsdt(params, apiToken)
-	params["signature"] = signature
 
 	log.Printf("[BepUsdt] signature params: %v", params)
 	log.Printf("[BepUsdt] signature: %s, token: %s", signature, apiToken)
 
-	body, _ := json.Marshal(params)
+	reqBody := BepUsdtCreateRequest{
+		TradeType:   tradeType,
+		OrderID:     strconv.Itoa(int(order.ID)),
+		Amount:      order.TotalAmount,
+		NotifyURL:   notifyURL,
+		RedirectURL: redirectURL,
+		Signature:   signature,
+	}
+
+	body, _ := json.Marshal(reqBody)
 	log.Printf("[BepUsdt] request body: %s", string(body))
 
 	req, err := http.NewRequest("POST", apiURL+"/api/v1/order/create-transaction", strings.NewReader(string(body)))