feat: finish the tailscale plugin, including SSH auth (B3)

plugins/host-metrics/manifest.json

@@ -49,7 +49,13 @@
           "component": "retention"
         }
       ]
-    }
+    },
+    "actionSlots": [
+      {
+        "id": "host-metrics.managers",
+        "accepts": ["component"]
+      }
+    ]
   },
   "locales": "locales",
   "platforms": ["linux", "win32", "darwin"]