fix: Code for category

internal/app/app.go

@@ -11,6 +11,7 @@ import (
 
 	"gis/api"
 	"gis/internal/config"
+	"gis/internal/domain"
 	"gis/internal/messaging/rabbitmq"
 	"gis/internal/parser"
 	"gis/internal/platform/logger"
@@ -87,6 +88,9 @@ func New(ctx context.Context) (*App, error) {
 // Handler builds the HTTP handler with all routes and readiness checks wired.
 func (a *App) Handler() stdhttp.Handler {
 	validate := validator.New(validator.WithRequiredStructEnabled())
+	validate.RegisterValidation("slug", func(fl validator.FieldLevel) bool {
+		return domain.ValidSlug(fl.Field().String())
+	})
 
 	health := transporthttp.NewHealthHandler(map[string]transporthttp.ReadinessCheck{
 		"postgres": func(ctx context.Context) error { return a.pool.Ping(ctx) },