Resolve all review comments

Author: Bihan Rana

src/dstack/_internal/core/compatibility/runs.py

@@ -96,8 +96,14 @@ def get_run_spec_excludes(run_spec: RunSpec) -> IncludeExcludeDictType:
         router = run_spec.configuration.router
         if router is None:
             configuration_excludes["router"] = True
-        elif isinstance(router, SGLangServiceRouterConfig) and router.pd_disaggregation is False:
-            configuration_excludes["router"] = {"pd_disaggregation": True}
+        elif isinstance(router, SGLangServiceRouterConfig):
+            router_excludes: IncludeExcludeDictType = {}
+            if router.pd_disaggregation is False:
+                router_excludes["pd_disaggregation"] = True
+            if router.managed_by == "gateway":
+                router_excludes["managed_by"] = True
+            if router_excludes:
+                configuration_excludes["router"] = router_excludes
         if run_spec.configuration.https is None:
             configuration_excludes["https"] = True