feat(install): default to Go agent binary from release agent-v0.6.8, drop Node.js dependency; NG_AGENT_IMPL=node fallback via run.sh; shell-only enroll JSON; units ExecStart the Go binary

openrc/nexusgate-agent

@@ -1,12 +1,20 @@
 #!/sbin/openrc-run
 
 description="NexusGate node agent"
-command="/opt/nexusgate-agent/run.sh"
+command="/opt/nexusgate-agent/nexusgate-agent"
 command_background="yes"
 pidfile="/run/nexusgate-agent.pid"
 output_log="/var/log/nexusgate/agent.log"
 error_log="/var/log/nexusgate/agent-error.log"
 
+# Go 二进制直接从环境变量读取 NG_CONTROLLER/NG_AGENT_KEY；OpenRC 不读
+# /etc/nexusgate/agent.env，这里在服务脚本里手动 source 并导出。
+if [ -f /etc/nexusgate/agent.env ]; then
+  set -a
+  . /etc/nexusgate/agent.env
+  set +a
+fi
+
 depend() {
   need net
   use nexusgate-sing-box