fix: suppress dupl lint for Search handler

The public Search and admin List handlers share structure but use
different types (SearchParams/AdminSearchParams, MarketSummary/
AdminMarketSummary). This is intentional, not a refactoring target.

backend/internal/domain/market/handler.go

@@ -17,7 +17,7 @@ func NewHandler(service *Service) *Handler {
 	return &Handler{service: service}
 }
 
-func (h *Handler) Search(c *gin.Context) {
+func (h *Handler) Search(c *gin.Context) { //nolint:dupl // similar structure to AdminHandler.List but different types
 	var params SearchParams
 	if err := c.ShouldBindQuery(&params); err != nil {
 		apiErr := apierror.BadRequest("invalid_params", err.Error())