新增摸大红业务并修复后台链接按钮白字

支持分类筛选、搜索、下单支付建群与固定二维码；合并迁移种子数据；后台表格编辑/详情链接恢复主题色可见。

backend/internal/modules/payment/service.go

@@ -32,6 +32,16 @@ func (s *Service) Start(ctx context.Context, userID uint64, orderID uint64, req
 	return s.repo.Start(ctx, userID, orderID, req, clientIP)
 }
 
+func (s *Service) StartMohong(ctx context.Context, userID uint64, orderID uint64, req StartPaymentRequest, clientIP string) (*PaymentDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	if userID == 0 || orderID == 0 {
+		return nil, ErrPaymentCannotStart
+	}
+	return s.repo.StartMohong(ctx, userID, orderID, req, clientIP)
+}
+
 func (s *Service) Query(ctx context.Context, userID uint64, orderID uint64) (*PaymentDTO, error) {
 	if s.repo == nil {
 		return nil, ErrDependencyUnavailable
@@ -42,6 +52,16 @@ func (s *Service) Query(ctx context.Context, userID uint64, orderID uint64) (*Pa
 	return s.repo.Query(ctx, userID, orderID)
 }
 
+func (s *Service) QueryMohong(ctx context.Context, userID uint64, orderID uint64) (*PaymentDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	if userID == 0 || orderID == 0 {
+		return nil, ErrPaymentNotFound
+	}
+	return s.repo.QueryMohong(ctx, userID, orderID)
+}
+
 func (s *Service) HandleLeshuaNotify(ctx context.Context, params map[string]string, rawPayload string, contentType string) (*NotifyResult, error) {
 	if s.repo == nil {
 		return nil, ErrDependencyUnavailable