feat(routes): add remote ingress controls and preserve-port targeting for route configuration

ts/config/classes.route-config-manager.ts

@@ -192,7 +192,16 @@ export class RouteConfigManager {
           }
         }
       }
-      stored.route = { ...stored.route, ...patch.route, action: mergedAction } as IDcRouterRouteConfig;
+      const mergedRoute = { ...stored.route, ...patch.route, action: mergedAction } as IDcRouterRouteConfig;
+
+      // Handle explicit null to remove optional top-level route properties (e.g., remoteIngress: null)
+      for (const [key, val] of Object.entries(patch.route)) {
+        if (val === null && key !== 'action' && key !== 'match') {
+          delete (mergedRoute as any)[key];
+        }
+      }
+
+      stored.route = mergedRoute;
     }
     if (patch.enabled !== undefined) {
       stored.enabled = patch.enabled;