feat: auto-start systemd service after RPM installation

- Add 'systemctl start logcorrelator.service' in post script
- Update both packaging/rpm/post and logcorrelator.spec
- Service is now enabled AND started automatically on install

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packaging/rpm/post

@@ -45,6 +45,7 @@ fi
 if [ -x /bin/systemctl ]; then
     systemctl daemon-reload
     systemctl enable logcorrelator.service
+    systemctl start logcorrelator.service
 fi
 
 exit 0