fix(agent99): recover external host through full closure chain

agent99.config.example.json

@@ -19,6 +19,7 @@
   "vmrunPath": "",
   "hosts": [
     "192.168.0.110",
+    "192.168.0.111",
     "192.168.0.112",
     "192.168.0.120",
     "192.168.0.121",
@@ -51,6 +52,33 @@
       "vmx": ""
     }
   ],
+  "externalHosts": [
+    {
+      "name": "host111-workstation",
+      "host": "192.168.0.111",
+      "recoveryAction": "wake_on_lan",
+      "macAddresses": [
+        "00:E0:4C:AF:10:0A",
+        "DA:64:76:98:F1:0E"
+      ],
+      "broadcastAddresses": [
+        "255.255.255.255",
+        "192.168.0.255"
+      ],
+      "ports": [
+        7,
+        9
+      ],
+      "packetBursts": 5,
+      "verifyTimeoutSeconds": 180,
+      "verifyIntervalSeconds": 5,
+      "verifyTcpPorts": [
+        22
+      ],
+      "enabled": true,
+      "required": true
+    }
+  ],
   "k3s": {
     "jumpHost": "192.168.0.110",
     "preferJumpHost": true,
@@ -206,6 +234,7 @@
         ],
     "requiredHosts": [
       "192.168.0.110",
+      "192.168.0.111",
       "192.168.0.112",
       "192.168.0.120",
       "192.168.0.121",