feat: add ValidationMiddleware to RouteModuleConfig

internal/handlers/routes.go

@@ -18,4 +18,5 @@ type RouteModuleConfig struct {
 	AuthRateLimit        func(chi.Router) chi.Router
 	CSRFMiddleware       func(http.Handler) http.Handler
 	AuthMiddleware       func(http.Handler) http.Handler
+	ValidationMiddleware func(http.Handler) http.Handler
 }