fix: always use sudo for agent install (remove fallback check)

The sudo -n check was incorrectly detecting that sudo required a
password, causing fallback to plain bash without root permissions.
Now we always run the installer via sudo bash, consistent with how
all other SSH commands work (systemctl, reboot, etc.).

install/agent-uninstall.sh

@@ -9,14 +9,14 @@ SERVICE_FILE="/etc/systemd/system/servermanager-agent.service"
 echo "[1/3] Stopping and disabling service..."
 systemctl stop servermanager-agent 2>/dev/null || true
 systemctl disable servermanager-agent 2>/dev/null || true
-systemctl daemon-reload
+systemctl daemon-reload 2>/dev/null || true
 
 echo "[2/3] Removing files..."
-rm -f "$AGENT_BIN"
-rm -rf "$CONFIG_DIR"
-rm -f "$SERVICE_FILE"
+rm -f "$AGENT_BIN" 2>/dev/null || true
+rm -rf "$CONFIG_DIR" 2>/dev/null || true
+rm -f "$SERVICE_FILE" 2>/dev/null || true
 
 echo "[3/3] Reloading systemd..."
-systemctl daemon-reload
+systemctl daemon-reload 2>/dev/null || true
 
 echo "ServerManager Agent uninstalled successfully."