agent: default sing-box stats API port 10086 -> 10089

Avoids the v2ray_api listen colliding with L-UI's fixed 10086 on
dual-homed nodes. NG_SINGBOX_API_PORT env still overrides. Aligns the
stats-query --server default and the doctor script fallback to the
same value. Agent version stays 0.6.8.

agent-go/main.go

@@ -82,7 +82,7 @@ func loadConfig() config {
 		KeyFile:            envOr("NG_KEY_FILE", "/etc/nexusgate/keys.json"),
 		SessionTokenFile:   envOr("NG_SESSION_TOKEN_FILE", root+"/session-token.json"),
 		TLSDir:             envOr("NG_TLS_DIR", "/etc/nexusgate/tls"),
-		APIPort:            envOr("NG_SINGBOX_API_PORT", "10086"),
+		APIPort:            envOr("NG_SINGBOX_API_PORT", "10089"),
 		PollMS:             int64(pollSec * 1000),
 	}
 }

agent/stats-query.go

@@ -16,7 +16,7 @@ import (
 )
 
 func main() {
-	server := flag.String("server", "127.0.0.1:10086", "sing-box statistics API address")
+	server := flag.String("server", "127.0.0.1:10089", "sing-box statistics API address")
 	flag.Parse()
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()

scripts/agent-doctor.sh

@@ -27,7 +27,7 @@ elif [[ -x /usr/local/bin/nexusgate-sing-box ]]; then
   if [[ -f /etc/nexusgate/sing-box/config.json ]]; then
     /usr/local/bin/nexusgate-sing-box check -c /etc/nexusgate/sing-box/config.json 2>&1 | tail -n 12
     printf '入站流量统计（累计）：\n'
-    /usr/local/bin/nexusgate-sing-box-stats --server="127.0.0.1:${NG_SINGBOX_API_PORT:-10086}" 2>&1 | head -c 900
+    /usr/local/bin/nexusgate-sing-box-stats --server="127.0.0.1:${NG_SINGBOX_API_PORT:-10089}" 2>&1 | head -c 900
     printf '\n'
   else
     printf '已安装，当前没有节点资源\n'