fix: add KillMode=none to systemd service — prevent nohup processes from being killed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: DavidsonGomes

install-service.sh

@@ -102,6 +102,7 @@ Documentation=https://github.com/EvolutionAPI/evo-nexus
 [Service]
 Type=oneshot
 RemainAfterExit=yes
+KillMode=none
 User=$SERVICE_USER
 Group=$SERVICE_USER
 WorkingDirectory=$SERVICE_DIR

setup.py

@@ -732,6 +732,7 @@ def _setup_systemd_service(service_user, install_dir, logs_dir):
 [Service]
 Type=oneshot
 RemainAfterExit=yes
+KillMode=none
 User={service_user}
 Group={service_user}
 WorkingDirectory={install_dir}