fix(install): guard refresh_gateway_service_if_loaded to prevent double restart

- Only call refresh_gateway_service_if_loaded on upgrades
- Skip for fresh installs (daemon was just installed and started)
- Fixes Greptile review feedback

scripts/install.sh

@@ -2442,10 +2442,11 @@ main() {
     # Install gateway daemon for fresh installs (not upgrades)
     if [[ "$is_upgrade" != "true" ]]; then
         install_gateway_daemon_if_needed
+    else
+        # Only refresh gateway service on upgrades (not fresh installs)
+        refresh_gateway_service_if_loaded
     fi
 
-    refresh_gateway_service_if_loaded
-
     # Step 6: Run doctor for migrations on upgrades and git installs
     local run_doctor_after=false
     if [[ "$is_upgrade" == "true" || "$INSTALL_METHOD" == "git" ]]; then